USRE43993E1 - Method and apparatus for scrambling and/or descrambling digital video data and digital audio data using control data - Google Patents

Method and apparatus for scrambling and/or descrambling digital video data and digital audio data using control data Download PDF

Info

Publication number
USRE43993E1
USRE43993E1 US11826682 US82668207A USRE43993E US RE43993 E1 USRE43993 E1 US RE43993E1 US 11826682 US11826682 US 11826682 US 82668207 A US82668207 A US 82668207A US RE43993 E USRE43993 E US RE43993E
Authority
US
Grant status
Grant
Patent type
Prior art keywords
marker
copy
control
word
prevention
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US11826682
Inventor
Tae Joon Park
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date
Family has litigation

Links

Images

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10Protecting distributed programs or content, e.g. vending or licensing of copyrighted material
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00217Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G11B20/00253Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
    • G11B20/00333Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored in header data, e.g. in sector headers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00485Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
    • G11B20/00557Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00731Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00746Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
    • G11B20/00753Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00731Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00746Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
    • G11B20/00753Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
    • G11B20/00768Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/913Television signal processing therefor for scrambling ; for copy protection
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2211/00Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
    • G06F2211/007Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/913Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91307Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
    • H04N2005/91328Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/913Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled

Abstract

A copy prevention method and apparatus of a digital magnetic recording/reproducing system performs the copy prevention function by encoding to insert a marker involving copy prevention function information and executing the function and allows a program supplier to realize a desired copy prevention function of various patterns, in which the marker formed by a control word for scrambling audio and video bit straps and copy prevention information for preventing an illegal copy is encrypted by an encoded key to be multiplexed with the audio and video bit strips scrambled by the control word. The marker transmitted is detected from the bit strips to be decrypted and analyzed by the encoded key to determine whether the copy is permitted or not, so that the detected marker is updated to be recorded on a video tape and the control word is produced from the marker to perform the descrambling to supply the result to a monitor to be displayed. Thus, the program supplier selects the copy prevention function, and a separate format converting apparatus is not required since a field defined within a GA format is utilized while an existing DVCR is not need to be changed for performing the copy prevention function as the data amount to be recorded is not increased.A method and apparatus for descrambling data are discussed. According to an embodiment, the invention provides a method of descrambling digital data using a digital data processing apparatus, the digital data processing apparatus including a descrambler, the method comprising: Initializing, by the digital data processing apparatus, the descrambler of the digital data processing apparatus based on control data to descramble a received digital data stream, the digital data stream being comprised of a plurality of packet units each including payload data, a first packet unit among the packet units further including a heading portion including the control data, wherein the descrambler is initialized based on the control data in the first packet unit for descrambling the first packet unit and one or more succeeding packet units; and descrambling, by the descrambler, the payload data in each of the packet units.

Description

This reissue application is a Continuation Application of Reissue application Ser. No. 09/592,148 (now abandoned) filed Jun. 12, 2000, which is a Continuation of Reissue application Ser. No. 09/094,575 (now U.S. Pat. No. Re. 37,052), which is a Reissue of U.S. Pat. No. 5,689,559, issued on Nov. 18, 1997 (U.S. application Ser. No. 08/566,000), all these applications are incorporated by reference. The present application also claims priority of Application No. 33336/1994 filed in Republic of Korea on Dec. 8, 1994 under 35 U.S.C. §119. Note: More than one reissue application has been filed for the reissue of U.S. Pat. No. 5,689,559. The reissue applications are Ser. No. 09/097,162 (Now U.S. Pat. No. Re. 36,919) filed Jun. 12, 1998, Ser. No. 09/094,575 (now U.S. Pat. No. Re. 37,052) filed Jun. 12, 1998, and Ser. No. 09/592,148 (now abandoned) filed Jun. 12, 2000; as well as Ser. No. 11/826,679 (now abandoned) filed Jul. 17, 2007, Ser. No. 11/826,680 filed Jul. 17, 2007, Ser. No. 11/826,681 (now abandoned) filed Jul. 17, 2007, Ser. No. 11/826,682 (present application) filed Jul. 17, 2007, Ser. No. 11/902,930 (now abandoned) filed Sep. 26, 2007, Ser. No. 12/179,432 (now abandoned) filed Jul. 24, 2008, Ser. No. 12/179,443 (now abandoned) filed Jul. 24, 2008, Ser. No. 12/179,453 (now abandoned) filed Jul. 24, 2008, Ser. No. 12/184,152 (now abandoned) filed July 31, 2008, and Ser. No. 12/621,430 (now abandoned) filed Nov. 18, 2009, all of which are continuations of Ser. No. 09/592,148; and Ser. No. 12/318,742 filed Jan. 7, 2009, Ser. No. 12/318,743 (now abandoned) filed Jan. 7, 2009, Ser. No. 12/318,744 (now abandoned) filed Jan. 7, 2009, Ser. No. 12/318,745 filed Jan. 7, 2009, and Ser. No. 12/318,746 filed Jan. 7, 2009, all of which are divisionals of Ser. No. 09/592,148; and Ser. No. 12/641,258 (now abandoned) filed Dec. 17, 2009, Ser. No. 12/641,273 (now abandoned) filed Dec. 17, 2009, and Ser. No. 12/641,266 (now abandoned) filed Dec. 17, 2009, all of which are continuations of Ser. No. 11/826,681, which is a continuation of Ser. No. 09/592,148.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a copy prevention method and apparatus of a digital magnetic recording/reproducing system, and more particularly to a copy prevention method and apparatus of a digital magnetic recording/reproducing system, wherein a marker involving copy prevention function information and executing the function is coded and inserted to perform the copy prevention function and realize the copy prevention function of various patterns desired by a program supplier includes control data for descrambling digital data.

2. Description of the Prior Art

One example of a conventional copy prevention method is described in U.S. Pat. No. 4,819,098, in which a signal inducing an interference to an automatic gain controller (AGC) circuit within a VCR is inserted to a video waveform to be recorded on a tape. When the tape is reproduced to display the signal on a television, the interference signal does not affect the AGC circuit of the television to allow, allowing for a normal display.

However, when the reproduced signal is recorded by another VCR, i.e., when it is duplicated, the interference signal brings about the interference in the AGC circuit of the recording VCR to record in causing an inaccurate signal level to be recorded. Accordingly, the nodal display cannot be attained when reproducing a duplicated tape.

As another example, U.S. Pat. No. 4,571,642 utilizes a control track employed during performing the reproduction for synchronizing a servo circuit within a VCR, thereby for embodying the copy prevention function. The basic concept of this patent is for altering a video signal to force the control track to be inaccurately recorded when the video signal is duplicated onto another tape.

Still another example is disclosed in U.S. Pat. No. 4,577,216, in which a phase noise or the like is inserted to in a chroma burst portion of a video signal to thereby embody the copy prevention function.

The above-mentioned methods are for using use a difference of between the sensitivity between of circuits of in a television and of a VCR. Thus, the copy prepared to prevent the copy thereof as above may not exert the copy prevention function in a certain VCR, but may not execute a normal display on a certain television.

The above copy prevention methods are of an analog system, which are available for preventing the copy of an NTSC-class video signal to an analog VCR. However, in case of a high-definition image of the analog television (ATV), the copy is performed by means of a digital VCR rather than an analog VCR, so that it is difficult to employ the copy prevention method of the analog system.

SUMMARY OF THE INVENTION

Therefore, it is an object of the present invention to provide a copy prevention method and apparatus of a digital magnetic recording/reproducing system applicable to a digital VCR and incorporated with various copy prevention functions to enable the selection of a copy prevention function desired by a program supplier.

To achieve the above object of the present invention, there is provided a copy prevention method of a digital magnetic recording/reproducing system, which is performed by an audio and video signal transmitting process and an audio and video signal receiving/recording process. The audio and video signal transmitted process is carried out in the sequence of encrypting a marker formed by a control word for scrambling audio and video bit strips and copy prevention information for preventing an illegal copy by means of an encoding key, and multiplexing the marker with the audio and video bit strips scrambled by the control word. Then, the audio and video signal receiving/recording process is performed in the sequence of detecting the marker from the transmitted bit strips, decrypting and analyzing the detected marker by means of an encoded key to determine whether copy is permitted or not, updating the detected marker to be recorded on a video tape, and generating the control word from the marker to perform a descrambling and supply the audio and video signals to be displayed on a monitor.

Also, a copy prevention apparatus of a digital magnetic recording/reproducing system includes a marker detecting and inserting part for detecting a marker from input bit strips, and inserting the updated marker to the bit strips to output the result. A marker analyzing and processing part decrypts and analyzes the encrypted marker from the marker detecting and inserting part by means of an encoded key, outputs a control word for descrambling the bit strips, and updates and encrypting the decrypted marker by means of the encoded key to output the result. In addition, a buffer part buffers the control word and updated and encrypted marker from the marker analyzing and processing section, and inserts the updated and encrypted marker in the marker detecting and inserting part, and a descrambler descrambles the bit strips provided via the marker detecting and inserting part by means of the control word from the buffer part.

BRIEF DESCRIPTION OF THE DRAWINGS

The above objects and other advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which:

FIG. 1 is a flow chart illustrating an audio and video signal transmitting process in a copy prevention method according to the present invention;

FIG. 2 is a flow chart illustrating an audio and video signal receiving and recording process in the copy prevention method according to the present invention;

FIG. 3 is a view showing a structure of transport bit strips according to the present invention;

FIG. 4 is a block diagram showing a schematic construction of a copy prevention apparatus according to the present invention;

FIG. 5 is a block diagram showing a detailed construction of FIG. 4; and

FIGS. 6A to 6F are signal waveforms of respective parts shown in FIG. 5.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A copy prevention method and apparatus of a digital magnetic recording/reproducing system according to the present invention emphasizes a fact that a DVCR can record all diverse signals on a video tape, so that a variety of input signals are largely classified into two, and different use a copy prevention methods are performed for each method based on the type of input signal.

First, signals transmitted from a terrestrial broadcasting system, a satellite broadcasting system and a pay television broadcasting system are classified as a broadcasting signal signals, and the following three copy prevention functions are applicable when recording the a broadcasting signal.

ThreeThe three copy prevention functions are a no recording onto a video tapepermitted, a free record/copy onto the tape, and a single generational recording onto the tape with no copy of the recorded tape.

Here, the third copy prevention function of the single generational recording onto the video tape with no duplication of the recorded tape is for enabling the signal from a television receiver to record on the tape be recorded once but inhibiting the re-recording of the signal by means of another, for example, a DVCR is prohibited while the firstly-recorded tape signal can be reproduced to watch through a monitor.

A second classification is for, for example, a rental tape to be identified by a pretaped signal. Here, the copy prevention function of the pretaped signal is similar to the above no recording onto the tape and the free record/copy onto the tape copy protection function, which and has the following three copy protection functions.

The three functions are no copy onto another tape, free copy to another tape and a single generational copy to another tape.

The single generational copy function to the other tape is of the copy prevention function for allowing a allows duplication from the original rental tape, but inhibiting inhibits another copy from the duplication, which is utilized in a digital audio tape (DAT) duplicate.

The present invention is advantageous in that a program supplier selects the above functions when providing a program. For this purpose, the program supplier inserts desired copy prevention function information, i.e., a marker, into a predetermined field within the program.

The marker inserted to transport data by the program supplier prior to being transmitted is encoded, and, in order to impede an illegal copy, an encoding key for interpreting the marker is transferred via a separate transmission line such as telephone line by a prescribed period interval, e.g., once a month, to be stored within a copy prevention apparatus.

In a system having an ATV decoder incorporated in a body with, for example, the DVCR in a body, a copy prevention apparatus for embodying the copy prevention functions executes a digital copy prevention function during an interface process between the ATV decoder and the DVCR, and. The copy prevention apparatus decodes and determines the marker of a received program by means of a received encoded encoding key to perform another function in accordance with respective copy prevention functions.

The copy prevention method of the digital magnetic recording/reproducing system according to the present invention is performed through an audio and video signal transmitting process as shown in FIG. 1, and an audio and video signal receiving and recording process as shown in FIG. 2.

The audio and video signal transmitting process is for encrypting the marker formed by a control word for scrambling audio and video bit strips and copy prevention (hereinafter simply referred to as “CP”) information for preventing an illegal duplication by means of an encoded key to multiplex and transmit the audio and video bit strips scrambled by the control word. Here, the marker is already formed by a program producer to be multiplexed and transmitted together with the audio and video bit strips.

In more detail, as shown in FIG. 1, the audio and video signal transmitting process is canted out in the sequence of an audio/video bitstrip encoding step 1 for encoding the audio and video bit strips, a control word generating step 2 for generating the control word for scrambling, and a scrambling step 6 for scrambling the encoded audio and video bit strips by means of the generated control word. Successively, a CP information generating step 3 generates the CP information for preventing the illegal copy, and marker producing and encrypting steps 4 and 5 generates respectively generate the marker by using the generated control word and CP information and encrypts encrypt the resulting marker by means of the encoded an encoding key. Finally, a multiplexing and transmitting step 7 multiplexes the scrambled audio and video bit strips and encrypted marker to transmit the result.

The audio and video signal receiving and recording process is performed in such a manner that the marker is detected from the transmitted bit strips and is decrypted by means of the encoded encoding key and analyzed. Thus, it is determined whether the copy is permitted or not to update the detected marker to be recorded on a video tape, the detected marker is updated accordingly, and the control word is produced from the marker to carry out the descrambling and display the signals on a monitor, in which. As a result, the audio and video signals transmitted from the program producer axe recorded or displayed in accordance with the marker.

More specifically, as shown inFIG. 2,shows the audio and video signal receiving and recording process is performed byin detail. As shown, the process includes marker detecting steps 11 and 12 for detecting the marker by demultiplexing the transmitted bit strips, and decrypting the marker by means of the encoded encoding key, and a marker analyzing step 13 for analyzing the detected marker to determine whether the a copy is permitted or not and for detecting the control word. Then, the transmitted audio and video bit strips are descrambled and decoded by using the detected control word to supply the audio and video signals in audio and video decoding steps 14 and 15. Thereafter, the detected marker is updated and encrypted by means of the encoded encoding key to be inserted in case of permitting the copy after analyzing the marker in a and reinserted in the transmitted audio and video bit strips in marker inserting steps 16, 17 and 18 if copying is permitted.

The above-stated process will be described in detail below.

To begin with, the program producer encodes the audio and video bit strips 1, generates the control word for scrambling 2, and scrambles the encoded audio and video bit strips by means of the generated control word 6.

Also, the CP information for preventing the illegal copy is generated 3, and the marker is generated by using the generated control word and CP information 4, and the coded key is utilized to perform the encryption 5.

Finally, the scrambled audio and video bit strips and encrypted marker ore multiplexed 7 to be transmitted for the program recording or reproduction.

The transmitted bit strips are demultiplexed to detect the marker 11, and the encoded. The encoding key is utilized to perform the decryption and the decrypted marker is output 12. The detected and decrypted marker is analyzed to determine whether the copy is permitted or not and the control word is detected 13.

The detected control word is used for descrambling and decoding the transmitted audio and video bit strips to provide the audio and video signals to the monitor to be displayed for display 14 and 15.

In addition, when it is determined that the a copy is permitted after analyzing the marker, the detected marker is updated to be encrypted, re-encrypted by means of the encoded encoding key, and the result is inserted to the audio and video bit strips to be recorded 16, 17 and 18.

Here, a position of inserting the marker will be observed with reference to FIG. 3.

The transmitted bit strips consists consist of transport packets of a fixed length, i.e., 188 bytes, in which a transport header is displaced on the preceding stage of the bit strips. The transport header is divided into a field of a fixed length of 4 bytes and an adaptation field of a variable length. Then, a transport-private-data field exists as one field within the adaption field. The transport-private-data field consists of an ID field and the encrypted marker. The ID field functions as a an identifier for informing that the transport-private-data field is a field utilized for the copy prevention method according to the present invention, and the encrypted marker following the ID field embodies the copy prevention function of the present invention.

When the marker is decrypted by means of the encoded encoding key, the decrypted marker is divided into a CP information area recorded with including the CP information for preventing the illegal copy, a control word area recorded with including the control word CW for descrambling, and a reserved area.

That is, the decrypted marker is formed of 8 bytes consisting of the CP information area of one byte, the reserved area of three bytes and control word area of four bytes.

At this time, the CP information is formatted by including a generational copy control field which restricts the number of permitting the copy permitted copies of the program, which. The generational copy control field is formed of an allowable generational field for limiting the copy number of the program and a current generational field representing a current generation of the duplicated program.

Next, the marker analyzing step 13 of the audio and video receiving and recording process will be described in detail.

The marker analyzing step 13 is carried out by the CP information detecting step of detecting the CP information for preventing the illegal copy from the detected marker, a copy number limiting step of comparing the allowable generation of the allowable generational field for restricting the number of permitting the copy of the program and the current generation of the current generational field representing the current generation of the duplicated program within the detected CP information to determine whether the copy is permitted or not, and the control word detecting step of detecting the control word from the detected marker for executing the descrambling.

In other words, the CP information for preventing the an illegal copy is detected from the detected marker, and the allowable generation of the allowable generational field for limiting the copy number of the program is compared with the current generation of the current generational field representing the current generation of the duplicated program within the detected CP information to determine whether the copy is permitted or not, so that the program is recorded in case of permitting the copy, otherwise the. Otherwise, reproduction cannot be executed in case of inhibiting the copy, even though the recording is attained.

Next, the control word for descrambling is detected from the detected marker.

Here, the step of limiting the copy number is carried out by comparing the allowable generation of the allowable generational field with the current generation of the current generational field to determine whether the allowable generation is the current generation, inhibiting the copy when it is determined that the allowable generation is below the current generation, and permitting the copy when it is determined that the allowable generation is not below the current generation to proceed to the marker insertion step.

The copy number limiting step will be described below.

When the allowable generation is below the current generation after comparing the allowable generation of the allowable generational field preset by the program producer with the current generation of the current generational field representing the current copy number, the copy number exceeds the copy number preset by the program producer. Thus, the copy cannot be further copying cannot be permitted.

At this time, in order to inhibit the copy, the control word is destructed or is not output to block the, which blocks reproduction after performing of the copy. This is because the audio and video bit strips are recorded under the state of being scrambled, the scrambled audio and video bit strips cannot be descrambled without the control word.

Therefore, by destructing the control word, the reproduction and display cannot be achieved even though the audio and video bit strips are recorded to; thereby have having the same effect of as impeding the recording of them.

At this time, since the control word is periodically changed in the of an interval of 0.6 second, the reproduction is impeded by destructing the succeeding control word even after accomplishing the recording.

Also, a control track within the video tape may be destructed to inhibit the copy when the recording medium is a video tape.

On the other hand, the marker is positioned on the private data field within the bit strips whenever the control word is changed.

Here, since the control word is periodically changed, the marker including the control word is received whenever the control word is changed to be supplied.

Meantime, the marker inserting step is performed by updating the marker when the copy is permitted after analyzing the marker 16, encrypting the updated marker by means of the encoded key 17, and replacing the encrypted marker with the following marker to be inserted 18.

In other words, if the copy is permitted after analyzing the marker, the current generation of the current generational field is augmented by one to update the marker 16. That is, the CP information including the updated current generational field obtained by augmenting the current generation by one is summed with the control word to be the updated marker.

The updated marker is encrypted by means of the encoded key to be replaced with encoding key and is inserted to replace the succeeding marker and inserted 17. More specifically, as the marker is supplied whenever the control word is changed, it is inserted whenever the control word is changed.

In other word words, as shown in FIG. 3, the detection of the encrypted marker and the replacement of the updated marker should be accomplished altogether on time basis.

Meanwhile, the encoded encoding key for encrypting and decrypting the marker is transmitted via a separate transmission line in a predetermined time interval and is stored to be utilized, thereby perfectly preventing the illegal copy.

That is, the marker encrypted by the encoded encoding key is transmitted and recorded together with the bit strips. Here, the control word for descrambling the scrambled audio and video bit strips is included in the marker, so that the marker should be primarily decrypted to obtain the control word. However, since the encoded encoding key for decrypting the marker is periodically changed, it is impossible to decrypt the marker without the encoded encoding key. Accordingly, it is further difficult to illegally obtain the control word.

As shown in FIG. 4, the copy prevention apparatus of the digital magnetic recording/reproducing system according to the present invention includes a marker detecting/inserting section 21, a descrambler 24, a marker analyzing/processing section 22 and a buffer section 23.

Marker detecting/inserting section 21 detects the marker from the received bit strips, and inserts to output the updated marker, i.e., the updated and encrypted marker, from buffer section 23 to the bit strips.

Marker analyzing/processing section 22 utilizes the encoded key encoding keys to decrypt and analyze the encrypted marker from marker detecting/inserting section 21, thereby providing the control word CW for descrambling the bit strips. Then, the decrypted marker is updated and encrypted by the encoded encoding key to be for output.

Buffer section 23 buffers control word CW and the updated and encrypted marker IEM from marker analyzing/processing section 22, so that the updated and encrypted marker IEM is supplied to be inserted in marker detecting/inserting section 21.

Descrambler 24 descrambles the bit strips output via marker detecting/inserting section 21 by means of the control word CW from buffer section 23 to supply the result to the monitor to be displayed or to, for example, a DVCR to record the bit strips inserted with the marker.

Here, the encoded encoding key is transmitted via the separate transmission line in at a predetermined time interval and is stored as the copy prevention method of the digital magnetic recording/reproducing system according to the present invention to double a copyright protection effect.

Referring to FIG. 3, the structure of the transport bit strips and marker will be described prior to describing the operation of the copy prevention apparatus of the digital magnetic recording/reproducing system constructed as above.

In the copy prevention apparatus of the digital magnetic recording/reproducing system, the marker is placed on the transport-private-data field within the bit strips, and the CP information area recorded with the CP information for preventing the illegal copy and the control word area recorded with the control word CW for descrambling are included thereto as shown in FIG. 3, like the copy prevention method.

Here, the CP information is formatted by including the generational copy control field for restricting the number of permitted copies of the program, which is formed of the allowable generational field for limiting the copy number of the program and the current generational field representing the current generation of the duplicated program.

The marker is formed of 8 bytes consisting of the CP information area of one byte and control word area of four bytes.

Hereinbelow, an operation of the copy prevention apparatus of the digital magnetic recording/reproducing system according to the present invention will be briefly described with reference to FIG. 4.

First, a process of displaying the input bit strips on the monitor will be described.

The input bit strips are supplied to marker analyzing/processing section 22 under the state that the marker is detected and encrypted in marker detecting/inserting section 21.

Encrypted marker EM is decrypted by means of the encoded encoding key to be analyzed in marker analyzing/processing section 22. At this time, the control word is detected from the analyzed marker to be buffered via buffer section 23 for descrambling the bit strips and is supplied to descrambler 24.

The bit strips, after detecting the detection of the marker in marker detecting/inserting section 21, are descrambled in descrambler 24 in accordance with the control word from buffer section 23, and provided to the monitor to be displayed for display.

Next, a process of recording the input bit strips via, for example, the DVCR will be described.

The process of detecting and analyzing the marker from the input bit strips is executed in the same manner.

That is, the input bit strips is are supplied to marker analyzing/processing section 22 under the state that the marker is detected and encrypted decrypted in marker detecting/inserting section 21.

Encrypted marker EM is decrypted by means of the encoded encoding key in marker analyzing/processing section 22 to detect the control word. At this time, the recording can be performed or not in accordance with the result of the analysis. If the recording is not permitted, the detected control word is destructed to impede the reproduction even though the recording can be attained. Otherwise, the current generation of the current generational field within the marker is augmented by one to update the marker, so that the encoded encoding key is utilized to encrypt the marker to supply, and the result is supplied to buffer section 23.

The updated and encrypted marker is buffered in buffer section 23 and is supplied to marker detecting/inserting section 21 to be inserted to the input bit strips.

Meantime, the control word is periodically changed in the interval of 0.6 second, and the marker is placed on the transport-private-data field within the bit strips whenever the control word is changed.

Consequently, the updated and encrypted marker is replaced with replaces the succeeding marker to be inserted.

The bit strips inserted with the updated and encrypted marker pass through descrambler 24 intact and are output to be recorded in the DVCR.

The detailed construction and operation of the copy prevention apparatus in the digital magnetic recording/reproducing system formed as above will be described with reference to the accompanying drawings.

FIG. 5 is a detailed construction view showing the copy prevention apparatus of FIG. 4, which will be described below.

Marker detecting/inserting section 21 includes a marker detector 31 which detects the encrypted marker from the input bit strips and supplies the detected marker to marker analyzing/processing section 22 and a marker detection flag signal for informing of the position of the encrypted marker within the bit strips to descrambler 24 to be. The flag is used as a reference signal of for initializing descrambler 24 while outputting the bit strips. In addition to marker detector 31, a marker inserter 32 inserts the updated and encrypted marker from buffer section 23 to into the bit strips from marker detector 31 in accordance with the marker detection flag signal from marker detector 31 to output the. The result is output to descrambler 24.

Marker analyzing/processing section 22 has a marker decoder 34 for decrypting the encrypted marker from marker detector 31 of marker detecting/inserting section 21 by means of the encoded encoding key, and a marker analyzer 34 for analyzing analyzes the CP information within the marker from marker decoder 34 to output the control word to buffer section 23 when the copy is permitted while outputting a control signal for updating the marker. Additionally, a marker updating/encoding unit 35 updates the marker from marker decoder 34 in accordance with the control signal from marker analyzer 34 to encrypt the marker by means of the encoded encoding key to output the result to buffer section 23.

Here, marker analyzing/processing section 22 further includes an encoding key storage unit (not shown) for storing the encoded encoding key and to output the result encoding key to marker decoder 33 and marker updating/encoding unit 35.

BesidesAlso, marker analyzer 34 compares the allowable generation of the allowable generational field for restricting the number of permitting the copy of the program with the current generation of the current generational field representing the current generation of the duplicated program to determine whether the a copy is permitted or not.

Buffer section 23 includes a marker buffer 36 for temporally storing the updated and encrypted marker from marker analyzing/processing section 22 to supply it to marker detecting/inserting section 21, and a control word buffer 37 for temporally storing the control word from marker analyzing/processing section 22 to supply it to descrambler 24.

An operation of the copy prevention apparatus of the digital magnetic recording system according to the present invention constructed as above will be described with reference to FIG. 6 FIGS. 6A-6G.

FIG. 6A is a timing chart of the transmitted bit strips, FIG. 6B is of illustrates the marker detection flag m-det-flag, FIG. 6C is of illustrates the control word CW(i) from marker analyzer 34, FIG. 6D is of illustrates the updated and encrypted marker IEM(i) from marker updating/encoding unit 35, FIG. 6F is of illustrates the updated and encrypted marker IEM(i) from marker buffer 36, and FIG. 6G is of illustrates the control word CW(i) from control word buffer 37.

Encrypted marker EM(i) is included in the transmitted bit strips.

The transmitted bit strips including encrypted marker EM(i) is are formed as shown in FIG. 6A, which is supplied to marker detector 31 to detect encrypted marker EM(i) to be supplied to marker decoder 33. Also, marker detector 31 generates marker detection flag signal m-det-flag for informing of the position of the encrypted marker at the encrypted marker EM(i) portion as shown in FIG. 6B, so that the generated signal is supplied to marker inserter 32 together with the bit strips including encrypted marker EM(i). Also, marker detection flag m-det-flag is supplied to descrambler 24 to be utilized as the reference signal for initializing descrambler 24 by control word CW(i−1) from control word buffer 37.

Encrypted marker EM(i) is decrypted by the encoding key in marker decoder 33 to be and is supplied as decrypted marker M(i).

Decrypted marker M(i) is analyzed in marker analyzer 34 to determine whether the copy is permitted or not. In other words, marker analyzer 34 compares the CP information within decrypted marker M(i), i.e., the allowable generational field with the current generational field, and determines to permit the copy when the allowable generational field is not below the current generational field.

When the copy is permitted as above, marker analyzer 34 slightly delays control word CW(i), which is a part of decrypted marker M(i), to be supplied to control word buffer 37, as shown in FIG. 6C. At this time, marker analyzer 34 provide provides the control signal to marker updating/encoding unit 35 to control the updating of the marker.

That is, marker decoder 33 form forms decrypted marker M(i) from encrypted marker EM(i) after delaying a a delay time required for the decode, and the marker analyzer 34 generates control word CW(i) from decrypted marker M(i) in marker analyzer 34.

At this time, control word CW(i) is transmitted to control word buffer 37 to be stored until it is utilized in descrambler 24.

Decrypted marker M(i) from marker decoder 33 is updated in accordance with the control signal from marker analyzer 34 in marker updating/encoding unit 35.

That is, the updated data is the data recorded on the current generational field within the marker, which is obtained by adding one to the previously recorded current generation.

The marker updated as described above is encrypted, i.e., encoded, in accordance with the encoded encoding key to be supplied to marker buffer 36 as shown in FIG. 6D, slightly delayed with respect to control word CW(i) from marker analyzer 34 as shown in FIG. 6C. In more detail, the encrypted marker M(i) from marker decoder 33 is supplied to marker updating/encoding unit 35 to be generated as marker IEM(i), which is updated and encrypted after delaying the a delay time required for the encoding to be, and marker IEM(i) is supplied to marker buffer 36.

Here, the point of generating updated and encrypted marker IEM(i) and control word CW(i) from marker updating/encoding unit 35 and marker analyzer 34 does not coincide with a point of utilizing updated and encrypted marker IEM(i) and control word CW(i) in marker inserter 32 and descrambler 24, i.e., the points of performing the replaceable insertion and initialization of descrambler 24 do not coincide with each other. Thus, updated and encrypted marker IEM(i) and control word CW(i) from marker updating/encoding unit 35 and marker analyzer 34 are temporally stored in marker buffer 36 and control word buffer 37 for that time.

As shown in FIG. 6E, updated and encrypted marker IEM(i) temporally stored in marker buffer 36 and synchronized to be output is inserted by marker inserter 32 to into the bit strips from marker detector 31.

In more detail, marker inserter 32 receives the bit strips having encrypted marker EM(i) and marker detection flag signal m-det-flag from marker detector 31, and receives updated and encrypted marker IEM(i) which will be replaceably inserted to into the position of encrypted marker EM(i) from marker buffer 36, so that updated and encrypted marker IEM(i) is replacably inserted to the position of marker detection flag signal m-det-flag in the transmitted bit strips including encrypted marker-EM(i) as shown in FIG. 6E.

In other words, marker inserter 32 inserts updated and encrypted marker IEM(i) from marker buffer 37 replacing encrypted marker EM(i+1) at the position of producing marker detection flag signal m-det-flag.

Here, the replacably inserted marker IEM(i) is formed from the immediately detected preceding encrypted marker. Accordingly, as shown in FIG. 6E, the marker IEM(i) is stored in marker buffer 37 for a certain period to be and then provided to marker inserter 32.

As shown in FIG. 6F, control word CW(i−1) is temporally stored in control word buffer 37 to be synchronized prior to being output and is utilized for descrambling the transmitted bit strips from marker inserter 32 in descrambler 24.

At this time, descrambler 24 uses marker detection flag signal m-det-flag from marker detector 31 as the reference signal for initializing based on control word CW(i−1) from control word buffer 37.

More specifically, descrambler 24 must be initialized by control word CW(i−N) from control word buffer 37 during a period from the point of generating encrypted marker EM(i), i.e., from a position of detecting marker detecting flag signal m-det-flag to the point before starting payload of a transport packet, where N is a natural number greater than zero. Here, control word CW(i−N) is a control word formed from encrypted marker EM(i−N) transmitted before encrypted marker EM(i) as many as N times. The natural number ‘N’ allows for arbitrarily controlling the initializing point of descrambler 24.

In the copy prevention method and apparatus of the digital magnetic recording/reproducing system according to the present invention as described above, a program supplier can select the copy prevention function, and the field defined within a GA format is utilized. As the result, a separate format transformation apparatus for the copy prevention function is not required, and there is no increase in data amount to be recorded to perform the copy prevention function without converting, for example, the general digital VCR.

While the present invention has been particularly shown and described with reference to particular embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be effected therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (45)

1. A copy prevention method of a digital magnetic recording/reproducing system comprising:
an audio and video signal transmitting process of encrypting a marker formed by a control word for scrambling audio and video bit strips and copy prevention information for preventing an illegal copy by means of an encoding key, and multiplexing said marker with said audio and video bit strips scrambled by said control word, and
an audio and video signal receiving/recording process of detecting said marker from said transmitted bit strips, decrypting and analyzing the detected marker by means of an encoded key to determine whether copy is permitted or not, updating said detected marker to be recorded on a video tape, and generating said control word from said marker to perform a descrambling and supply the audio and video signals to be displayed on a monitor.
2. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 1, wherein said marker is placed on a transport-private-data field within said bit strips.
3. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 2, wherein said marker is comprised of a copy prevention information area recorded with said copy prevention information for preventing said illegal copy, and a control word area recorded with said control word for descrambling.
4. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 3, wherein said marker is formed of 8 bytes.
5. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 4, wherein said copy prevention area is formed of one byte.
6. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 4, wherein said control word area is formed of four bytes.
7. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 3, wherein said copy prevention information is formatted by including a generational copy control field for restricting the number of permitting said copy of a program.
8. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 7, wherein said generational copy control field comprises:
an allowable generational field for restricting the copy number of said program; and
a current generational field representing a current generation of a duplicated program.
9. A copy prevention-method of a digital magnetic recording/reproducing system as claimed in claim 1, wherein said audio and video transmitting process comprises:
an audio and video bit-strip encoding step of encoding said audio and video bit strips;
a control word generating step of generating said control word for scrambling;
a scrambling step for scrambling said encoded audio and video bit strips by means of said generated control word;
a copy prevention information generating step of generating said copy prevention information for preventing said illegal copy;
a marker generating and encrypting step of generating said marker by means of said generated control word and copy prevention information and encrypting said marker by means of said encoded key; and
a multiplexing and transmitting step of multiplexing to transmit said scrambled audio and video bit strips and encrypted marker.
10. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 1, wherein said audio and video signal receiving/recording process comprises:
a marker detecting step of demultiplexing said transmitted bit strips to detect said marker, and decrypting said marker by means of said encoded key;
a marker analyzing step of analyzing said detected marker to determine whether said copy is permitted or not, and detecting said control word;
an audio and video decoding step of descrambling and decoding said transmitted audio and video bit strips by means of said detected control word, and outputting said audio and video signals; and
a marker inserting step of updating said detected marker and encrypting said updated marker by means of said encoded key to insert the result when it is determined that said copy is permitted after analyzing said marker.
11. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 10, wherein said marker analyzing step comprises:
a copy prevention information detecting step of detecting said copy prevention information for preventing said illegal copy from said detected marker;
a copy number restricting step of comparing an allowable generation of said allowable generational field and a current generation of said current generational field representing said current generation for restricting the number of permitting said copy of said program within said detected copy prevention information, and determining whether said copy is permitted or not-to process the result; and
a control word detecting step of detecting said control word for descrambling from said detected marker.
12. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 11, wherein said copy number restricting step comprises:
comparing mid allowable generation of said allowable generational field with said current generation of said current generational field to determine whether said allowable veneration is below said current generation;
inhibiting said copy when it is determined that said allowable generation is below said current generation; and
permitting said copy when it is determined that said allowable generation is-not below said current generation, and proceeding to said marker inserting step.
13. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 12, wherein said step of inhibiting said copy is performed by destructing said control word or impeding an output of said control word to block a reproduction after recording.
14. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 10, wherein said control word is periodically changed.
15. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 14, wherein said control word is changed in the interval of 0.6 second.
16. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 14, wherein said marker is placed on said transport-private-data field within said bit strips whenever said control word is changed.
17. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 16, wherein said marker inserting step comprises the steps of:
updating said marker when the analysis of said marker determines to permit said copy;
encrypting said updated marker by means of said encoded key; and
replacably inserting said encrypted marker with a succeeding marker.
18. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 1, wherein said encoded key is transported via a separate transmission line to be stored.
19. A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 18, wherein said encoded key is transported via said separate transmission line for a prescribed time interval.
20. A copy prevention apparatus of a digital magnetic recording/reproducing system comprising:
an encrypted marker detecting and inserting part for detecting a marker from input bit strips, and inserting an updated marker to said bit strips to output the result;
a marker analyzing and processing part for decrypting and analyzing the encrypted marker from said marker detecting and inserting part by means of an encoded key, outputting a control word for descrambling said bit strips, and updating and encrypting the decrypted marker by means of said encoded key to output the result;
a buffer part for buffering said control word and updated and encrypted marker from said marker analyzing and processing part, and inserting said updated and encrypted marker in said marker detecting and inserting part; and
a descrambler for descrambling said bit strips provided via said marker detecting and inserting pant by means of said control word from said buffer part.
21. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said encoded key is transported via a separate transmission line to be stored.
22. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 21, wherein said encoded key is transported via said separate transmission line for a prescribed time interval.
23. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said marker is placed on a transport-private-data field within said bit strips whenever said control word is changed.
24. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 23, wherein said marker is comprised of a copy prevention information area recorded with said copy prevention information for preventing said illegal copy, and a control word area recorded with said control word for descrambling.
25. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 24, wherein said marker is formed of 8 bytes.
26. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 25, wherein said copy prevention area is formed of one byte.
27. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 25, wherein said control word area is formed of four bytes.
28. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 24, wherein said copy prevention information is formatted by including a generational copy control field for restricting the copy number of a program.
29. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 28, wherein said generational copy control field comprises:
an allowable generational field for restricting the number of permitting the copy of a program; and
a current generational field representing a current generation of a duplicated program.
30. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said control word is periodically changed.
31. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 30, wherein said control word is changed in the interval of 0.6 second.
32. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 30, wherein said marker is placed on a transport-private-data field within said bit strips whenever said control word is changed.
33. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 30, wherein said marker detecting and inserting part replacably inserts said updated marker with a succeeding marker.
34. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said marker detecting and inserting part comprises:
a marker detecting section for detecting to output said encrypted marker from said input bit strips to said marker analyzing and processing part, outputting a marker detection flag signal for informing of the position of said encrypted marker within said bit strips to said descrambler to be used as a reference signal of initializing said descrambler, and outputting said bit strips; and
a marker inserting section for inserting said updated and encrypted marker from said buffer part to said bit strips from said marker detecting section in accordance with said marker detection flag signal from said marker detecting section to output the result to said descrambler.
35. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 24, wherein said marker analyzing and processing part comprises:
a marker decoding section for decrypting said encrypted marker from said marker detecting and insetting part by means of said encoded key;
a marker analyzing section for analyzing said copy prevention information within said marker from said marker decoding section, and outputting said control word to said buffer part and a control signal for updating said marker when said copy is permitted; and
a marker updating and encoding section for updating said marker from said marker decoding section in accordance with said control signal from said marker analyzing section, and encrypting said updated marker by means of said encoded key to output the result to said buffer part.
36. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 35, wherein said marker analyzing and processing part further comprises an encoded key storage section for storing said encoded key to output it to said marker analyzing section and marker updating and encoding section.
37. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 35, wherein said marker analyzing section compares an allowable generation of an allowable generational field with a current generation of a current generational field representing a current generation of a duplicated program to determine whether said copy is permitted or not.
38. A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said buffer part comprises:
a marker buffer for temporally storing said updated and encrypted marker from said marker analyzing and processing part, and outputting the result to said marker detecting and inserting part; and
a control word buffer for temporally storing said control word from said marker analyzing and processing part, and outputting the result to said descrambler.
39. A method of descrambling digital data using a digital data processing apparatus including a descrambler, the method comprising:
receiving, by a receiver, a digital data stream including scrambled digital audio data and scrambled digital video scrambled data formed in a plurality of 188 byte packet units;
detecting, by the processing apparatus, a header portion of a first 188 byte packet unit among the plurality of 188 byte packet units;
detecting, by the processing apparatus, the control data from the header portion of the first 188 byte packet unit;
directly initializing, by the processing apparatus, the descrambler using the detected control data;
descrambling, by the same descrambler and the same control word, the digital audio data and/or the digital video data included in the first 188 byte data packet unit;
descrambling, by the same descrambler and the same control word, one or more succeeding 188 byte packet units including both the digital audio data and the digital video data included in the one or more succeeding 188 byte packet units;
determining, by the processing apparatus, whether a minimum of a multiple of four 188 byte packet units have been descrambled; and
re-initializing, by the processing apparatus, the descrambler based on different control data for descrambling a different set of 188 byte packet units based on the determination that the minimum of the multiple of four 188 byte packet units have been descrambled.
40. The method of claim 39, wherein the detecting the control data detects the control data based on a signal associated with a position of the control data within the digital data stream.
41. The method of claim 39, further comprising:
decoding the descrambled data to output an original signal.
42. An apparatus for descrambling digital data, the apparatus comprising:
a processor; and
a memory connected to the processor and including executable instructions that when executed, cause the processor to perform:
receiving a digital data stream including scrambled digital audio data and scrambled digital video data formed in a plurality of 188 byte packet units;
detecting a header portion of a first 188 byte packet unit among the plurality of 188 byte packet units;
detecting the control data from the header portion of the first 188 byte packet unit;
directly initializing, by the digital data apparatus, the descrambler of the digital data processing apparatus based on the detected control data;
descrambling, by the same descrambler and the same control word, the digital audio data and/or the digital video data included in the first 188 byte data packet unit;
descrambling, by the same descrambler and the same control word, one or more succeeding packet units including both the digital audio data and the digital video data included in the one or more succeeding packet units;
determining whether a minimum of a multiple of four packet units have been descrambled; and
re-initializing the descrambler based on different control data for descrambling a different set of 188 byte packet units based on the determination that the minimum of the multiple of four 188 byte packet units have been descrambled.
43. The apparatus of claim 42, wherein the detecting the control data detects the control data based on a signal associated with a position of the control data within the digital data stream.
44. The apparatus of claim 42, wherein the executable instructions further cause the processor to perform:
decoding the descrambled data to output an original signal.
45. The apparatus of claim 42, wherein the executable instructions further cause the processor to perform:
temporally storing the detected control data in a storage device.
US11826682 1994-12-08 2007-07-17 Method and apparatus for scrambling and/or descrambling digital video data and digital audio data using control data Expired - Lifetime USRE43993E1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR33336/1994 1994-12-08
KR19940033336A KR0136458B1 (en) 1994-12-08 1994-12-08 Copy protection apparatus of digital magnetic recording and reproducing system
US08566000 US5689559A (en) 1994-12-08 1995-12-01 Copy prevention method and apparatus of a digital magnetic recording/reproducing system
US09094575 USRE37052E1 (en) 1994-12-08 1998-06-12 Copy prevention method and apparatus of a digital recording/reproducing system employing a marker including copy protection information and code data for descrambling
US59214800 true 2000-06-12 2000-06-12
US11826682 USRE43993E1 (en) 1994-12-08 2007-07-17 Method and apparatus for scrambling and/or descrambling digital video data and digital audio data using control data

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09097162 USRE36919E (en) 1994-12-08 1998-06-12 Method and apparatus for communicating scrambled digital data
US11826682 USRE43993E1 (en) 1994-12-08 2007-07-17 Method and apparatus for scrambling and/or descrambling digital video data and digital audio data using control data

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US08566000 Reissue US5689559A (en) 1994-12-08 1995-12-01 Copy prevention method and apparatus of a digital magnetic recording/reproducing system

Publications (1)

Publication Number Publication Date
USRE43993E1 true USRE43993E1 (en) 2013-02-12

Family

ID=19400751

Family Applications (7)

Application Number Title Priority Date Filing Date
US08566000 Expired - Lifetime US5689559A (en) 1994-12-08 1995-12-01 Copy prevention method and apparatus of a digital magnetic recording/reproducing system
US09097162 Expired - Lifetime USRE36919E (en) 1994-12-08 1998-06-12 Method and apparatus for communicating scrambled digital data
US09094575 Expired - Lifetime USRE37052E1 (en) 1994-12-08 1998-06-12 Copy prevention method and apparatus of a digital recording/reproducing system employing a marker including copy protection information and code data for descrambling
US11826680 Expired - Lifetime USRE44068E1 (en) 1994-12-08 2007-07-17 Method and apparatus for descrambling digital video data and digital audio data using control data
US11826682 Expired - Lifetime USRE43993E1 (en) 1994-12-08 2007-07-17 Method and apparatus for scrambling and/or descrambling digital video data and digital audio data using control data
US12318746 Expired - Lifetime USRE44106E1 (en) 1994-12-08 2009-01-07 Copy prevention method and apparatus of a digital recording/reproducing system
US12318745 Expired - Lifetime USRE44121E1 (en) 1994-12-08 2009-01-07 Copy prevention method and apparatus of a digital recording/reproducing system

Family Applications Before (4)

Application Number Title Priority Date Filing Date
US08566000 Expired - Lifetime US5689559A (en) 1994-12-08 1995-12-01 Copy prevention method and apparatus of a digital magnetic recording/reproducing system
US09097162 Expired - Lifetime USRE36919E (en) 1994-12-08 1998-06-12 Method and apparatus for communicating scrambled digital data
US09094575 Expired - Lifetime USRE37052E1 (en) 1994-12-08 1998-06-12 Copy prevention method and apparatus of a digital recording/reproducing system employing a marker including copy protection information and code data for descrambling
US11826680 Expired - Lifetime USRE44068E1 (en) 1994-12-08 2007-07-17 Method and apparatus for descrambling digital video data and digital audio data using control data

Family Applications After (2)

Application Number Title Priority Date Filing Date
US12318746 Expired - Lifetime USRE44106E1 (en) 1994-12-08 2009-01-07 Copy prevention method and apparatus of a digital recording/reproducing system
US12318745 Expired - Lifetime USRE44121E1 (en) 1994-12-08 2009-01-07 Copy prevention method and apparatus of a digital recording/reproducing system

Country Status (6)

Country Link
US (7) US5689559A (en)
EP (1) EP0716544B1 (en)
JP (1) JP3105777B2 (en)
KR (1) KR0136458B1 (en)
CN (1) CN1074888C (en)
DE (2) DE69526310D1 (en)

Families Citing this family (79)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7089212B2 (en) 1992-12-15 2006-08-08 Sl Patent Holdings Llc System and method for controlling access to protected information
US6266654B1 (en) 1992-12-15 2001-07-24 Softlock.Com, Inc. Method for tracking software lineage
US7831516B2 (en) 1992-12-15 2010-11-09 Sl Patent Holdings Llc System and method for redistributing and licensing access to protected information among a plurality of devices
US5748763A (en) * 1993-11-18 1998-05-05 Digimarc Corporation Image steganography system featuring perceptually adaptive and globally scalable signal embedding
US6560349B1 (en) 1994-10-21 2003-05-06 Digimarc Corporation Audio monitoring using steganographic information
KR0152788B1 (en) 1994-11-26 1998-10-15 이헌조 Copy protecting method and apparatus of digital image system
KR0136458B1 (en) 1994-12-08 1998-05-15 구자홍 Copy protection apparatus of digital magnetic recording and reproducing system
CN1912885B (en) * 1995-02-13 2010-12-22 英特特拉斯特技术公司 Systems and methods for secure transaction management and electronic rights protection
JP4518574B2 (en) * 1995-08-11 2010-08-04 ソニー株式会社 Recording method and apparatus, recording medium, and reproducing method and apparatus
US6687828B1 (en) * 1995-08-11 2004-02-03 Sony Corporation Method and apparatus for ciphering playback mode information for recording on record medium
ES2206594T3 (en) * 1995-10-31 2004-05-16 Koninklijke Philips Electronics N.V. Conditional Access shifted over time.
US5719937A (en) * 1995-12-06 1998-02-17 Solana Technology Develpment Corporation Multi-media copy management system
KR100472335B1 (en) * 1996-12-19 2005-02-21 마쯔시다덴기산교 가부시키가이샤 Optical disk, method for recording and reproducing write-once information on and from optical disk, optical disk reproducing device, optical disk recording and reproucing device, device for recording write-once information on optical disk, and optical disk recording device
JPH09297798A (en) * 1996-05-08 1997-11-18 Matsushita Electric Ind Co Ltd Copy preventing device for multimedia equipment
US7221853B1 (en) * 1996-09-05 2007-05-22 Sony Corporation Digital recording apparatus and copyright protection method thereof
US6298196B1 (en) 1996-09-05 2001-10-02 Sony Corporation Digital recording apparatus and copyright protection method thereof
JP3941178B2 (en) 1996-09-05 2007-07-04 ソニー株式会社 Recording medium, digital recording devices, and control ic
JPH1093914A (en) * 1996-09-18 1998-04-10 Sony Corp Data transmitting method, data transmitter, parameter setting method of data receiver, data receiver, data transmitting system, reproducing method and reproducing device
FR2751771B1 (en) * 1996-10-31 1999-01-15 Thomson Multimedia Sa Autonomous Information carrier containing a scrambled
KR20000064791A (en) * 1997-01-27 2000-11-06 엠. 제이. 엠. 반 캄 Method and system for transmitting additional information relating to the content and information that
JPH10247362A (en) * 1997-03-06 1998-09-14 Sony Corp Method for preventing duplication of information signal and device therefor
US6792538B1 (en) 1997-09-05 2004-09-14 Pioneer Electronic Corporation Information generating method and apparatus, information reproducing method and apparatus, and information record medium
EP0901122B1 (en) * 1997-09-05 2006-06-14 Pioneer Electronic Corporation Information generating method and apparatus, information reproducing method and apparatus, and information record medium
FR2770675B1 (en) * 1997-11-06 1999-12-31 Aeta Applic Electroniques Tech Device for decoding a digital audio signal capable of a satisfactory listen on specified criteria acoustic
US6278807B1 (en) * 1997-11-13 2001-08-21 Kabushiki Kaisha Toshiba Data recording/reproducing apparatus, data recording/reproducing method applied to the apparatus, and computer program product used in data processing apparatus
JP4106740B2 (en) 1998-02-18 2008-06-25 ソニー株式会社 The information recording apparatus and method, information reproducing apparatus and method, and a program recording medium
US6643451B1 (en) * 1998-03-25 2003-11-04 Sanyo Electric Co., Ltd Image data alteration preventing apparatus and alteration preventing method
US6137952A (en) * 1998-04-02 2000-10-24 Hewlett-Packard Company Apparatus and method for degrading the quality of unauthorized copies of color images and video sequences
JP3097655B2 (en) 1998-05-11 2000-10-10 日本電気株式会社 Data transmission system
JP2000021085A (en) * 1998-06-30 2000-01-21 Pioneer Electron Corp Ciphering device and record medium
WO2000004549A3 (en) * 1998-07-14 2001-06-07 Koninkl Philips Electronics Nv Copy protection by ticket encryption
US6530021B1 (en) * 1998-07-20 2003-03-04 Koninklijke Philips Electronics N.V. Method and system for preventing unauthorized playback of broadcasted digital data streams
US6931531B1 (en) * 1998-09-02 2005-08-16 Matsushita Electric Industrial Co., Ltd. Image object recording, compression, and encryption method and system
US6490686B1 (en) * 1998-10-05 2002-12-03 Ati International Srl Method and apparatus for restricting privilege access to distributed content information
US6584552B1 (en) 1998-11-02 2003-06-24 Matsushita Electric Industrial Co., Ltd. Recording/reproducing apparatus, program recorded medium, recorded medium, cache device, and transmitter
DE69932695D1 (en) * 1998-12-11 2006-09-21 Sony Corp Technology for data copy control
JP4131071B2 (en) * 1999-01-11 2008-08-13 ソニー株式会社 Recording apparatus information signals, recording system, a recording medium and a recording method
US6963884B1 (en) * 1999-03-10 2005-11-08 Digimarc Corporation Recoverable digital content degradation: method and apparatus
US6697489B1 (en) * 1999-03-30 2004-02-24 Sony Corporation Method and apparatus for securing control words
US6847949B1 (en) 1999-05-10 2005-01-25 Koninklijke Philips Electronics N.V. Indicator system for screening protected material
JP2000322825A (en) * 1999-05-13 2000-11-24 Hitachi Ltd Digital signal-recording apparatus
JP2001057022A (en) * 1999-08-18 2001-02-27 Sony Corp Data recording medium, data recording device, data recording method, data reproducing device and data reproducing method
EP2104100A3 (en) * 1999-09-30 2012-02-22 Panasonic Corporation Information recording medium for recording a scrambled part of content information, and method and apparatus for reproducing information recorded therein
EP1094463A2 (en) * 1999-10-21 2001-04-25 Matsushita Electric Industrial Co., Ltd. Data recording apparatus, medium and information package
CN1257508C (en) * 1999-12-28 2006-05-24 松下电器产业株式会社 Recording apparatus
CN101261859A (en) 1999-12-28 2008-09-10 松下电器产业株式会社 Recording apparatus, recording and reproduction apparatus
US6898038B1 (en) * 2000-03-15 2005-05-24 Seagate Technology, Llc Method and apparatus for disc drive data security using fields in servo wedges
EP1143722B1 (en) * 2000-04-07 2008-11-05 Irdeto Access B.V. Data scrambling and descrambling system
WO2001080563A1 (en) * 2000-04-17 2001-10-25 Nagravision S.A. Secure data transmission system and method
JP3818021B2 (en) * 2000-06-06 2006-09-06 日本ビクター株式会社 Control word encryption device and control word decoding device
JP2004510192A (en) * 2000-09-20 2004-04-02 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィKoninklijke Philips Electronics N.V. Delivery of content
JP3804856B2 (en) * 2000-11-30 2006-08-02 日本ビクター株式会社 Dubbing system
JP2002262254A (en) * 2001-03-06 2002-09-13 Nec Microsystems Ltd Moving picture reproducing device and its method
EP1271880A2 (en) * 2001-06-07 2003-01-02 Hitachi, Ltd. Method and system for contents control
JP2003018565A (en) * 2001-06-28 2003-01-17 Pioneer Electronic Corp Video signal transmitting system
KR100491903B1 (en) * 2001-07-06 2005-05-27 가부시키가이샤 히타치세이사쿠쇼 Digital information recording apparatus and outputting apparatus
US20030138201A1 (en) * 2002-01-18 2003-07-24 Cabot Microelectronics Corp. Self-aligned lens formed on a single mode optical fiber using CMP and thin film deposition
KR100955976B1 (en) * 2002-01-28 2010-05-04 소니 주식회사 Information recording apparatus and method, and information reproduction apparatus and method
US7356147B2 (en) * 2002-04-18 2008-04-08 International Business Machines Corporation Method, system and program product for attaching a title key to encrypted content for synchronized transmission to a recipient
US20040007690A1 (en) * 2002-07-12 2004-01-15 Cabot Microelectronics Corp. Methods for polishing fiber optic connectors
US7398008B2 (en) * 2002-09-19 2008-07-08 Hewlett-Packard Development Company, L.P. Copy protection for analog video signals from computing devices
US7224310B2 (en) * 2002-11-20 2007-05-29 Nagravision S.A. Method and device for the recognition of the origin of encrypted data broadcasting
EP1869881A4 (en) * 2005-04-13 2010-12-08 Samsung Electronics Co Ltd Method of packaging broadcast contents
EP2276027A3 (en) * 2005-07-19 2012-03-14 Samsung Electronics Co., Ltd. Method and apparatus for a scrambled part of content
KR100762957B1 (en) * 2005-07-19 2007-10-04 삼성전자주식회사 Method and apparatus for descrambling AV stream
EP2122570B1 (en) * 2006-11-16 2017-01-04 NDS Limited System for embedding data
JP4536092B2 (en) * 2007-07-30 2010-09-01 日本放送協会 Processor conditional access system
JP4536091B2 (en) * 2007-07-30 2010-09-01 日本放送協会 Processing apparatus and processing method of conditional access system
US9031241B2 (en) * 2009-02-05 2015-05-12 D.E. Shaw Research, Llc Link and physical coding sub-layer protocols
US8555332B2 (en) 2010-08-20 2013-10-08 At&T Intellectual Property I, L.P. System for establishing communications with a mobile device server
US8438285B2 (en) 2010-09-15 2013-05-07 At&T Intellectual Property I, L.P. System for managing resources accessible to a mobile device server
US8443420B2 (en) * 2010-10-01 2013-05-14 At&T Intellectual Property I, L.P. System for communicating with a mobile device server
US8516039B2 (en) 2010-10-01 2013-08-20 At&T Intellectual Property I, L.P. Apparatus and method for managing mobile device servers
US8504449B2 (en) 2010-10-01 2013-08-06 At&T Intellectual Property I, L.P. Apparatus and method for managing software applications of a mobile device server
US8478905B2 (en) 2010-10-01 2013-07-02 At&T Intellectual Property I, Lp System for synchronizing to a mobile device server
US9392316B2 (en) 2010-10-28 2016-07-12 At&T Intellectual Property I, L.P. Messaging abstraction in a mobile device server
US9066123B2 (en) 2010-11-30 2015-06-23 At&T Intellectual Property I, L.P. System for monetizing resources accessible to a mobile device server
US8989055B2 (en) 2011-07-17 2015-03-24 At&T Intellectual Property I, L.P. Processing messages with a device server operating in a telephone
US9462332B2 (en) 2012-12-05 2016-10-04 At&T Intellectual Property I, L.P. Method and apparatus for controlling a media device

Citations (94)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753228A (en) 1971-12-29 1973-08-14 Westinghouse Air Brake Co Synchronizing arrangement for digital data transmission systems
US4420829A (en) 1981-01-08 1983-12-13 Carlson John E Holographic system for the storage of audio, video and computer data
US4554461A (en) 1982-12-24 1985-11-19 Hitachi, Ltd. Information transmitting apparatus
US4694489A (en) 1983-12-22 1987-09-15 Frederiksen Jeffrey E Video transmission system
US4736422A (en) 1983-06-30 1988-04-05 Independent Broadcasting Authority Encrypted broadcast television system
EP0267039A2 (en) 1986-11-05 1988-05-11 Satellite Technology Services, Inc. Video system and method for controlled videotaping
US4796220A (en) 1986-12-15 1989-01-03 Pride Software Development Corp. Method of controlling the copying of software
US4802215A (en) 1983-07-22 1989-01-31 Independent Broadcasting Authority Security system for television signal encryption
US4817140A (en) 1986-11-05 1989-03-28 International Business Machines Corp. Software protection system using a single-key cryptosystem, a hardware-based authorization system and a secure coprocessor
US4871140A (en) 1988-05-20 1989-10-03 Moore Push-Pin Company Hanging device
US4890319A (en) 1984-09-21 1989-12-26 Scientific-Atlantic, Inc. Method for controlling copying of protected information transmitted over a communications link
USRE33189E (en) 1981-11-19 1990-03-27 Communications Satellite Corporation Security system for SSTV encryption
US4916738A (en) 1986-11-05 1990-04-10 International Business Machines Corp. Remote access terminal security
US4924513A (en) 1987-09-25 1990-05-08 Digital Equipment Corporation Apparatus and method for secure transmission of data over an unsecure transmission channel
US4937679A (en) 1986-08-11 1990-06-26 Macrovision Dual deck video recording apparatus having enhanced copy protection and method for providing enhanced copy protection to such a recording apparatus
US4965680A (en) 1987-06-30 1990-10-23 Kabushiki Kaisha Toshiba Apparatus for releasing a restriction on the recording of an information signal on a recording medium
US4975952A (en) 1985-09-04 1990-12-04 U. S. Philips Corporation Method of data communication
US4999806A (en) 1987-09-04 1991-03-12 Fred Chernow Software distribution system
US5003590A (en) 1989-12-18 1991-03-26 Eidak Corporation Encoding an optical video disc to inhibit video tape recording
US5014274A (en) 1988-04-08 1991-05-07 Victor Company Of Japan, Ltd. Code-error correcting device
US5034985A (en) 1989-11-13 1991-07-23 Pitney Bowes Inc. Matched mailing system employing address print array recognition
US5034981A (en) 1988-04-11 1991-07-23 Eidak Corporation Anti-copying video signal processing
US5054064A (en) 1990-03-29 1991-10-01 Gte Laboratories Incorporated Video control system for recorded programs
US5058162A (en) 1990-08-09 1991-10-15 Hewlett-Packard Company Method of distributing computer data files
US5057947A (en) 1988-02-10 1991-10-15 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus with limited digital copying
US5073925A (en) 1987-07-08 1991-12-17 Matsushita Electric Industrial Co., Ltd. Method and apparatus for the protection of signal copy
US5109413A (en) 1986-11-05 1992-04-28 International Business Machines Corporation Manipulating rights-to-execute in connection with a software copy protection mechanism
US5134656A (en) 1989-02-22 1992-07-28 Kudelski S.A. Fabrique D'enregistruers Nagra Pre-payment television system using a memory card associated with a decoder
US5138659A (en) 1991-05-02 1992-08-11 General Instrument Corporation Conversion of television signal formats with retention of common control data stream
EP0498617A2 (en) 1991-02-07 1992-08-12 Matsushita Electric Industrial Co., Ltd. Digital signal transmitting method
US5144658A (en) 1989-11-24 1992-09-01 Sharp Kabushiki Kaisha Repeater of digital audio interface signal
US5159633A (en) 1990-01-19 1992-10-27 Canon Kabushiki Kaisha Multimedia network system
EP0519320A2 (en) 1991-06-18 1992-12-23 Matsushita Electric Industrial Co., Ltd. Video theater system and copy preventive method
US5182680A (en) 1990-02-26 1993-01-26 Sony Corporation Recording control system
US5193176A (en) 1990-10-17 1993-03-09 Powercard Supply C.A. Computer work saving during power interruption
US5231546A (en) 1988-02-10 1993-07-27 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus with limited digital copying
US5233650A (en) 1989-03-03 1993-08-03 Sun Plan Investments Limited Telephone support device
US5243650A (en) * 1990-03-23 1993-09-07 Televerket Method and apparatus for encryption/decryption of digital multisound in television
US5260999A (en) 1991-06-28 1993-11-09 Digital Equipment Corporation Filters in license management system
US5265164A (en) 1991-10-31 1993-11-23 International Business Machines Corporation Cryptographic facility environment backup/restore and replication in a public key cryptosystem
EP0580367A2 (en) 1992-07-24 1994-01-26 Sony Corporation Video signal transmission, recording and reproduction
EP0581227A2 (en) 1992-07-28 1994-02-02 Hitachi, Ltd. Apparatus for the recording and/or the reproducing of video signals
US5289276A (en) 1992-06-19 1994-02-22 General Electric Company Method and apparatus for conveying compressed video data over a noisy communication channel
JPH0670282A (en) 1992-06-16 1994-03-11 Matsushita Electric Ind Co Ltd Video signal recording and reproducing device
EP0589459A1 (en) 1992-09-24 1994-03-30 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus
CN1085723A (en) 1992-07-21 1994-04-20 松下电器产业株式会社 Scramble apparatus and descramble apparatus
US5315448A (en) 1993-03-18 1994-05-24 Macrovision Corporation Copy protection for hybrid digital video tape recording and unprotected source material
JPH06162690A (en) 1992-11-20 1994-06-10 Sony Corp Transmitter
US5381481A (en) * 1993-08-04 1995-01-10 Scientific-Atlanta, Inc. Method and apparatus for uniquely encrypting a plurality of services at a transmission site
US5392351A (en) 1992-03-16 1995-02-21 Fujitsu Limited Electronic data protection system
US5406625A (en) 1991-11-22 1995-04-11 Sony Corporation Receiving apparatus and recording method
US5442541A (en) 1993-07-23 1995-08-15 Xerox Corporation Enabling features over common communication channel
US5469272A (en) 1991-03-05 1995-11-21 Sony Corporation Digital signal recording and/or reproducing apparatus
US5477276A (en) 1992-12-17 1995-12-19 Sony Corporation Digital signal processing apparatus for achieving fade-in and fade-out effects on digital video signals
US5504816A (en) 1994-02-02 1996-04-02 Gi Corporation Method and apparatus for controlling access to digital signals
US5506903A (en) 1993-04-06 1996-04-09 Sony Corporation Digital multiplex transmission system
US5513260A (en) 1994-06-29 1996-04-30 Macrovision Corporation Method and apparatus for copy protection for various recording media
US5530756A (en) * 1993-09-15 1996-06-25 U.S. Philips Corporation Television scrambling and descrambling method, and transmitter and receiver using said method
US5546461A (en) 1993-04-09 1996-08-13 Matsushita Electric Industrial Co., Ltd. Scramble system for use in digital video signal recording and reproducing system or transmission and receiving system, comprising scramble apparatus and descramble apparatus
US5563946A (en) 1994-04-25 1996-10-08 International Business Machines Corporation Method and apparatus for enabling trial period use of software products: method and apparatus for passing encrypted files between data processing systems
US5574787A (en) 1994-07-25 1996-11-12 Ryan; John O. Apparatus and method for comprehensive copy protection for video platforms and unprotected source material
US5576843A (en) 1993-10-29 1996-11-19 Time Warner Entertainment Co., L.P. System and method for controlling play of multiple dialog audio tracks of a software carrier
US5579120A (en) 1993-10-08 1996-11-26 Sony Corporation Copyright protection for digital signal recording and/or reproduction and recording medium thereof
US5583562A (en) 1993-12-03 1996-12-10 Scientific-Atlanta, Inc. System and method for transmitting a plurality of digital services including imaging services
US5588058A (en) 1993-03-31 1996-12-24 U.S. Philips Corporation Method and device for scrambling and descrambling of a specific television broadcast
US5590306A (en) 1992-09-08 1996-12-31 Fuji Photo Film Co., Ltd. Memory card management system for writing data with usage and recording codes made significant
US5629980A (en) 1994-11-23 1997-05-13 Xerox Corporation System for controlling the distribution and use of digital works
US5638513A (en) 1993-12-22 1997-06-10 Ananda; Mohan Secure software rental system using continuous asynchronous password verification
US5646992A (en) 1993-09-23 1997-07-08 Digital Delivery, Inc. Assembly, distribution, and use of digital information
US5659613A (en) 1994-06-29 1997-08-19 Macrovision Corporation Method and apparatus for copy protection for various recording media using a video finger print
US5673357A (en) 1994-02-15 1997-09-30 Sony Corporation Video recording, transmitting and reproducing apparatus with concurrent recording and transmitting or multiple dubbing of copy protected video signals
US5689561A (en) 1995-10-06 1997-11-18 Pace; Michael Computer-based trading card system and method
US5689559A (en) 1994-12-08 1997-11-18 Lg Electronics Inc. Copy prevention method and apparatus of a digital magnetic recording/reproducing system
US5703859A (en) 1995-09-01 1997-12-30 Sony Corporation Digital video copy protection system
US5715403A (en) 1994-11-23 1998-02-03 Xerox Corporation System for controlling the distribution and use of digital works having attached usage rights where the usage rights are defined by a usage rights grammar
US5757910A (en) 1993-04-06 1998-05-26 Goldstar Co., Ltd. Apparatus for preventing illegal copying of a digital broadcasting signal
US5757909A (en) 1994-11-26 1998-05-26 Lg Electronics, Inc. Illegal view and copy protection method in digital video system and controlling method thereof
US5761302A (en) 1994-11-26 1998-06-02 Lg Electronics Inc. Copy prevention method and apparatus for digital video system
US5778064A (en) 1995-03-31 1998-07-07 Sony Corporation Apparatus and method for processing a high definition video signal
US5790664A (en) 1996-02-26 1998-08-04 Network Engineering Software, Inc. Automated system for management of licensed software
US5799081A (en) 1995-09-18 1998-08-25 Lg Electronics Inc. Illegal view/copy protection method and apparatus for digital broadcasting system
US5832084A (en) 1995-11-10 1998-11-03 Lg Electronics, Inc. Recording method of digital magnetic recording medium for copyright protection and variable speed playback
US5862115A (en) 1993-11-30 1999-01-19 Victor Company Of Japan, Ltd. Method and apparatus for recording an information signal with scrambling thereof
US5881038A (en) 1994-04-18 1999-03-09 Matsushita Electric Industrial Co., Ltd. Method and apparatus for preventing illegal copy or illegal installation of information of optical recording medium
US5898695A (en) 1995-03-29 1999-04-27 Hitachi, Ltd. Decoder for compressed and multiplexed video and audio data
US5907443A (en) 1990-05-30 1999-05-25 Canon Kabushiki Kaisha Recording and reproducing apparatus adapted to selectively control the number of copies made
US5910987A (en) 1995-02-13 1999-06-08 Intertrust Technologies Corp. Systems and methods for secure transaction management and electronic rights protection
US5925127A (en) 1997-04-09 1999-07-20 Microsoft Corporation Method and system for monitoring the use of rented software
US5956505A (en) 1991-12-24 1999-09-21 Pitney Bowes Inc. Remote activation of software features in a data processing device
US6009401A (en) 1998-04-06 1999-12-28 Preview Systems, Inc. Relicensing of electronically purchased software
US6236971B1 (en) 1994-11-23 2001-05-22 Contentguard Holdings, Inc. System for controlling the distribution and use of digital works using digital tickets
US6430290B1 (en) 1998-01-23 2002-08-06 Koninklijke Philips Electronics N.V. Conditional access
US7069250B2 (en) 2001-10-15 2006-06-27 Payformance Corporation Check based online payment and verification system and method
US7114745B2 (en) 2002-12-10 2006-10-03 Trw Automotive Safety Systems Gmbh Monitoring system for detent connections

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3194638B2 (en) 1993-01-07 2001-07-30 ペルメレック電極株式会社 Liquid in the propulsion device
JP3250333B2 (en) 1993-04-02 2002-01-28 ソニー株式会社 Video signal processing method, a video signal recording method, a video signal reproducing method, a video signal processing apparatus, a video signal recording apparatus and a video signal reproducing apparatus
US5464404A (en) * 1993-09-20 1995-11-07 Abela Laser Systems, Inc. Cardiac ablation catheters and method

Patent Citations (103)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753228A (en) 1971-12-29 1973-08-14 Westinghouse Air Brake Co Synchronizing arrangement for digital data transmission systems
US4420829A (en) 1981-01-08 1983-12-13 Carlson John E Holographic system for the storage of audio, video and computer data
USRE33189E (en) 1981-11-19 1990-03-27 Communications Satellite Corporation Security system for SSTV encryption
US4554461A (en) 1982-12-24 1985-11-19 Hitachi, Ltd. Information transmitting apparatus
US4736422A (en) 1983-06-30 1988-04-05 Independent Broadcasting Authority Encrypted broadcast television system
US4802215A (en) 1983-07-22 1989-01-31 Independent Broadcasting Authority Security system for television signal encryption
US4694489A (en) 1983-12-22 1987-09-15 Frederiksen Jeffrey E Video transmission system
US4890319A (en) 1984-09-21 1989-12-26 Scientific-Atlantic, Inc. Method for controlling copying of protected information transmitted over a communications link
US4975952A (en) 1985-09-04 1990-12-04 U. S. Philips Corporation Method of data communication
US4937679A (en) 1986-08-11 1990-06-26 Macrovision Dual deck video recording apparatus having enhanced copy protection and method for providing enhanced copy protection to such a recording apparatus
US5109413A (en) 1986-11-05 1992-04-28 International Business Machines Corporation Manipulating rights-to-execute in connection with a software copy protection mechanism
EP0267039A2 (en) 1986-11-05 1988-05-11 Satellite Technology Services, Inc. Video system and method for controlled videotaping
US4817140A (en) 1986-11-05 1989-03-28 International Business Machines Corp. Software protection system using a single-key cryptosystem, a hardware-based authorization system and a secure coprocessor
US4916738A (en) 1986-11-05 1990-04-10 International Business Machines Corp. Remote access terminal security
US4796220A (en) 1986-12-15 1989-01-03 Pride Software Development Corp. Method of controlling the copying of software
US4965680A (en) 1987-06-30 1990-10-23 Kabushiki Kaisha Toshiba Apparatus for releasing a restriction on the recording of an information signal on a recording medium
US5073925A (en) 1987-07-08 1991-12-17 Matsushita Electric Industrial Co., Ltd. Method and apparatus for the protection of signal copy
US4999806A (en) 1987-09-04 1991-03-12 Fred Chernow Software distribution system
US4924513A (en) 1987-09-25 1990-05-08 Digital Equipment Corporation Apparatus and method for secure transmission of data over an unsecure transmission channel
US5057947A (en) 1988-02-10 1991-10-15 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus with limited digital copying
US5231546A (en) 1988-02-10 1993-07-27 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus with limited digital copying
US5014274A (en) 1988-04-08 1991-05-07 Victor Company Of Japan, Ltd. Code-error correcting device
US5034981A (en) 1988-04-11 1991-07-23 Eidak Corporation Anti-copying video signal processing
US4871140A (en) 1988-05-20 1989-10-03 Moore Push-Pin Company Hanging device
US5134656A (en) 1989-02-22 1992-07-28 Kudelski S.A. Fabrique D'enregistruers Nagra Pre-payment television system using a memory card associated with a decoder
US5233650A (en) 1989-03-03 1993-08-03 Sun Plan Investments Limited Telephone support device
US6052242A (en) 1989-06-07 2000-04-18 Canon Kabushiki Kaisha Recording apparatus with copy control based on copies made and allowed to be made
US5034985A (en) 1989-11-13 1991-07-23 Pitney Bowes Inc. Matched mailing system employing address print array recognition
US5144658A (en) 1989-11-24 1992-09-01 Sharp Kabushiki Kaisha Repeater of digital audio interface signal
US5003590A (en) 1989-12-18 1991-03-26 Eidak Corporation Encoding an optical video disc to inhibit video tape recording
US5159633A (en) 1990-01-19 1992-10-27 Canon Kabushiki Kaisha Multimedia network system
US5182680A (en) 1990-02-26 1993-01-26 Sony Corporation Recording control system
US5243650A (en) * 1990-03-23 1993-09-07 Televerket Method and apparatus for encryption/decryption of digital multisound in television
US5054064A (en) 1990-03-29 1991-10-01 Gte Laboratories Incorporated Video control system for recorded programs
US5907443A (en) 1990-05-30 1999-05-25 Canon Kabushiki Kaisha Recording and reproducing apparatus adapted to selectively control the number of copies made
US5058162A (en) 1990-08-09 1991-10-15 Hewlett-Packard Company Method of distributing computer data files
US5193176A (en) 1990-10-17 1993-03-09 Powercard Supply C.A. Computer work saving during power interruption
EP0498617A2 (en) 1991-02-07 1992-08-12 Matsushita Electric Industrial Co., Ltd. Digital signal transmitting method
US5469272A (en) 1991-03-05 1995-11-21 Sony Corporation Digital signal recording and/or reproducing apparatus
US5138659A (en) 1991-05-02 1992-08-11 General Instrument Corporation Conversion of television signal formats with retention of common control data stream
EP0519320A2 (en) 1991-06-18 1992-12-23 Matsushita Electric Industrial Co., Ltd. Video theater system and copy preventive method
US5303294A (en) 1991-06-18 1994-04-12 Matsushita Electric Industrial Co., Ltd. Video theater system and copy preventive method
US5260999A (en) 1991-06-28 1993-11-09 Digital Equipment Corporation Filters in license management system
US5265164A (en) 1991-10-31 1993-11-23 International Business Machines Corporation Cryptographic facility environment backup/restore and replication in a public key cryptosystem
US5406625A (en) 1991-11-22 1995-04-11 Sony Corporation Receiving apparatus and recording method
US5956505A (en) 1991-12-24 1999-09-21 Pitney Bowes Inc. Remote activation of software features in a data processing device
US5392351A (en) 1992-03-16 1995-02-21 Fujitsu Limited Electronic data protection system
JPH0670282A (en) 1992-06-16 1994-03-11 Matsushita Electric Ind Co Ltd Video signal recording and reproducing device
US5289276A (en) 1992-06-19 1994-02-22 General Electric Company Method and apparatus for conveying compressed video data over a noisy communication channel
CN1085723A (en) 1992-07-21 1994-04-20 松下电器产业株式会社 Scramble apparatus and descramble apparatus
US5377266A (en) * 1992-07-21 1994-12-27 Matsushita Electric Industrial Co., Ltd. Scramble apparatus and descramble apparatus
USRE36763E (en) 1992-07-24 2000-07-04 Sony Corporation Apparatus and method for preventing unauthorized copying of video signals
EP0580367A2 (en) 1992-07-24 1994-01-26 Sony Corporation Video signal transmission, recording and reproduction
US5418853A (en) 1992-07-24 1995-05-23 Sony Corporation Apparatus and method for preventing unauthorized copying of video signals
EP0581227A2 (en) 1992-07-28 1994-02-02 Hitachi, Ltd. Apparatus for the recording and/or the reproducing of video signals
US5590306A (en) 1992-09-08 1996-12-31 Fuji Photo Film Co., Ltd. Memory card management system for writing data with usage and recording codes made significant
EP0589459A1 (en) 1992-09-24 1994-03-30 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus
US5323244A (en) 1992-09-24 1994-06-21 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus
JPH06162690A (en) 1992-11-20 1994-06-10 Sony Corp Transmitter
US5477276A (en) 1992-12-17 1995-12-19 Sony Corporation Digital signal processing apparatus for achieving fade-in and fade-out effects on digital video signals
US5315448A (en) 1993-03-18 1994-05-24 Macrovision Corporation Copy protection for hybrid digital video tape recording and unprotected source material
US5588058A (en) 1993-03-31 1996-12-24 U.S. Philips Corporation Method and device for scrambling and descrambling of a specific television broadcast
US5757910A (en) 1993-04-06 1998-05-26 Goldstar Co., Ltd. Apparatus for preventing illegal copying of a digital broadcasting signal
US5506903A (en) 1993-04-06 1996-04-09 Sony Corporation Digital multiplex transmission system
US5546461A (en) 1993-04-09 1996-08-13 Matsushita Electric Industrial Co., Ltd. Scramble system for use in digital video signal recording and reproducing system or transmission and receiving system, comprising scramble apparatus and descramble apparatus
US5442541A (en) 1993-07-23 1995-08-15 Xerox Corporation Enabling features over common communication channel
US5381481A (en) * 1993-08-04 1995-01-10 Scientific-Atlanta, Inc. Method and apparatus for uniquely encrypting a plurality of services at a transmission site
US5530756A (en) * 1993-09-15 1996-06-25 U.S. Philips Corporation Television scrambling and descrambling method, and transmitter and receiver using said method
US5646992A (en) 1993-09-23 1997-07-08 Digital Delivery, Inc. Assembly, distribution, and use of digital information
US5579120A (en) 1993-10-08 1996-11-26 Sony Corporation Copyright protection for digital signal recording and/or reproduction and recording medium thereof
US5576843A (en) 1993-10-29 1996-11-19 Time Warner Entertainment Co., L.P. System and method for controlling play of multiple dialog audio tracks of a software carrier
US5862115A (en) 1993-11-30 1999-01-19 Victor Company Of Japan, Ltd. Method and apparatus for recording an information signal with scrambling thereof
US5583562A (en) 1993-12-03 1996-12-10 Scientific-Atlanta, Inc. System and method for transmitting a plurality of digital services including imaging services
US5638513A (en) 1993-12-22 1997-06-10 Ananda; Mohan Secure software rental system using continuous asynchronous password verification
US5504816A (en) 1994-02-02 1996-04-02 Gi Corporation Method and apparatus for controlling access to digital signals
US5673357A (en) 1994-02-15 1997-09-30 Sony Corporation Video recording, transmitting and reproducing apparatus with concurrent recording and transmitting or multiple dubbing of copy protected video signals
US5881038A (en) 1994-04-18 1999-03-09 Matsushita Electric Industrial Co., Ltd. Method and apparatus for preventing illegal copy or illegal installation of information of optical recording medium
US5563946A (en) 1994-04-25 1996-10-08 International Business Machines Corporation Method and apparatus for enabling trial period use of software products: method and apparatus for passing encrypted files between data processing systems
US5513260A (en) 1994-06-29 1996-04-30 Macrovision Corporation Method and apparatus for copy protection for various recording media
US5659613A (en) 1994-06-29 1997-08-19 Macrovision Corporation Method and apparatus for copy protection for various recording media using a video finger print
US5574787A (en) 1994-07-25 1996-11-12 Ryan; John O. Apparatus and method for comprehensive copy protection for video platforms and unprotected source material
US5629980A (en) 1994-11-23 1997-05-13 Xerox Corporation System for controlling the distribution and use of digital works
US6236971B1 (en) 1994-11-23 2001-05-22 Contentguard Holdings, Inc. System for controlling the distribution and use of digital works using digital tickets
US5715403A (en) 1994-11-23 1998-02-03 Xerox Corporation System for controlling the distribution and use of digital works having attached usage rights where the usage rights are defined by a usage rights grammar
US6028932A (en) 1994-11-26 2000-02-22 Lg Electronics Inc. Copy prevention method and apparatus for digital video system
US5761302A (en) 1994-11-26 1998-06-02 Lg Electronics Inc. Copy prevention method and apparatus for digital video system
US5757909A (en) 1994-11-26 1998-05-26 Lg Electronics, Inc. Illegal view and copy protection method in digital video system and controlling method thereof
USRE37052E1 (en) 1994-12-08 2001-02-13 Lg Electronics, Inc. Copy prevention method and apparatus of a digital recording/reproducing system employing a marker including copy protection information and code data for descrambling
US5689559A (en) 1994-12-08 1997-11-18 Lg Electronics Inc. Copy prevention method and apparatus of a digital magnetic recording/reproducing system
USRE36919E (en) 1994-12-08 2000-10-17 Lg Electroncs, Inc. Method and apparatus for communicating scrambled digital data
US5910987A (en) 1995-02-13 1999-06-08 Intertrust Technologies Corp. Systems and methods for secure transaction management and electronic rights protection
US5898695A (en) 1995-03-29 1999-04-27 Hitachi, Ltd. Decoder for compressed and multiplexed video and audio data
US5778064A (en) 1995-03-31 1998-07-07 Sony Corporation Apparatus and method for processing a high definition video signal
US5703859A (en) 1995-09-01 1997-12-30 Sony Corporation Digital video copy protection system
US5799081A (en) 1995-09-18 1998-08-25 Lg Electronics Inc. Illegal view/copy protection method and apparatus for digital broadcasting system
US5689561A (en) 1995-10-06 1997-11-18 Pace; Michael Computer-based trading card system and method
US5832084A (en) 1995-11-10 1998-11-03 Lg Electronics, Inc. Recording method of digital magnetic recording medium for copyright protection and variable speed playback
US5790664A (en) 1996-02-26 1998-08-04 Network Engineering Software, Inc. Automated system for management of licensed software
US5925127A (en) 1997-04-09 1999-07-20 Microsoft Corporation Method and system for monitoring the use of rented software
US6430290B1 (en) 1998-01-23 2002-08-06 Koninklijke Philips Electronics N.V. Conditional access
US6009401A (en) 1998-04-06 1999-12-28 Preview Systems, Inc. Relicensing of electronically purchased software
US7069250B2 (en) 2001-10-15 2006-06-27 Payformance Corporation Check based online payment and verification system and method
US7114745B2 (en) 2002-12-10 2006-10-03 Trw Automotive Safety Systems Gmbh Monitoring system for detent connections

Non-Patent Citations (31)

* Cited by examiner, † Cited by third party
Title
Derfler, "How Networks Work", Bestseller Edition, 1996, Ziff-Davis Press, Emeryville, CA, all pages.
Gralla, "How the Internet Works", Millennium Edition, 1999, que Corporation, Indianapolis, IN, all pages.
ISO/IEC 13818-1, "Information Technology-Generic Coding of Moving Pictures and Associated Audio: Systems" International Standard. Nov. 13, 1994, 1-144 (all pages).
ISO/IEC 13818-1, "Information Technology—Generic Coding of Moving Pictures and Associated Audio: Systems" International Standard. Nov. 13, 1994, 1-144 (all pages).
ISO/IEC. 13818-2, "Information Technology-Generic Coding of Moving Pictures and Associated Audio Information. Video", International Standard. 1995, pp. 1-243 (all pages).
ISO/IEC. 13818-2, "Information Technology—Generic Coding of Moving Pictures and Associated Audio Information. Video", International Standard. 1995, pp. 1-243 (all pages).
MPEG-2 Systems Working Draft, ISO/IEC/JTC1/SC29/WG11/N0601, Nov. 1993. *
Muller, "Desktop Encyclopedia of the Internet". 1999, Artech House Inc., Norwood, MA, all pages.
Strunk, Jr. et al., "The Elements of Style", Third Edition, MacMillan Publishing Co., Inc., 59 pages, 1979.
Systems Working Committee, "MPEG-2 Systems Working Draft", International Organization for Standardization, ISO/IEC/JTC1/SC29/WG11N0601, 114 pages, Nov. 1993.
U.S. Appl. No. 09/592,148, filed Jun. 12, 2000.
U.S. Appl. No. 10/909,248, filed Aug. 2, 2004.
U.S. Appl. No. 10/981,797, filed Nov. 5, 2004.
U.S. Appl. No. 10/981,798, filed Nov. 5, 2004.
U.S. Appl. No. 11/040,606, filed Jan. 24, 2005.
U.S. Appl. No. 11/040,607, filed Jan. 24, 2005.
U.S. Appl. No. 11/826,679, filed Jul. 17, 2007.
U.S. Appl. No. 11/826,681, filed Jul. 17, 2007.
U.S. Appl. No. 11/826,860, filed Jul. 17, 2007.
U.S. Appl. No. 11/896,279, filed Aug. 30, 2007.
U.S. Appl. No. 11/902,930, filed Sep. 26, 2007.
U.S. Appl. No. 12/139,161, filed Jun. 13, 2008.
U.S. Appl. No. 12/179,432, filed Jul. 24, 2008.
U.S. Appl. No. 12/179,443, filed Jul. 24, 2008.
U.S. Appl. No. 12/179,453, filed Jul. 24, 2008.
U.S. Appl. No. 12/184,152, filed Jul. 31, 2008.
U.S. Appl. No. 12/405,011, filed Mar. 16, 2009.
U.S. Appl. No. 12/405,053, filed Mar. 16, 2009.
Wasilewski, "MPEG-2 systems specification: Blueprint for network interoperability", Communications Technology, 8 pages, Feb. 1994.
Wasilewski, Anthony J., "MPEG-2 Systems Specification: Blueprint for Network Interoperability," Communications Technology, Feb. 1994. *
White, "How Computers Work", Millennium Edition, 1999, Que Corporation, Indianapolis, IN, all pages.

Also Published As

Publication number Publication date Type
CN1074888C (en) 2001-11-14 grant
USRE44068E1 (en) 2013-03-12 grant
CN1131796A (en) 1996-09-25 application
USRE37052E1 (en) 2001-02-13 grant
US5689559A (en) 1997-11-18 grant
EP0716544B1 (en) 2002-04-10 grant
USRE44106E1 (en) 2013-03-26 grant
JP3105777B2 (en) 2000-11-06 grant
EP0716544A3 (en) 1997-06-18 application
JPH08237596A (en) 1996-09-13 application
EP0716544A2 (en) 1996-06-12 application
USRE36919E (en) 2000-10-17 grant
KR0136458B1 (en) 1998-05-15 grant
DE69526310T2 (en) 2002-10-02 grant
DE69526310D1 (en) 2002-05-16 grant
USRE44121E1 (en) 2013-04-02 grant

Similar Documents

Publication Publication Date Title
US7184550B2 (en) Method and apparatus for simultaneous decryption and re-encryption of publicly distributed content via stream ciphers
US7203311B1 (en) Super encrypted storage and retrieval of media programs in a hard-paired receiver and storage device
US20050114909A1 (en) High definition media storage structure and playback mechanism
US6668324B1 (en) System and method for safeguarding data within a device
US7203314B1 (en) Super encrypted storage and retrieval of media programs with modified conditional access functionality
US5590194A (en) Method of and apparatus for scrambling a video signal with full network transmission and recording capability
US5787179A (en) Scrambling and descrambling of data with improved security
EP0580367A2 (en) Video signal transmission, recording and reproduction
US6571220B1 (en) Copy generation management method, information signal reproducing method, information signal reproducing apparatus, and information signal recording apparatus
US6523113B1 (en) Method and apparatus for copy protection
US20030190044A1 (en) Content using system
US7239709B1 (en) Data recording/reproducing method, data recording/reproducing system, recording apparatus
US6363149B1 (en) Method and apparatus for accessing stored digital programs
US20070258586A1 (en) Personal video recorder having dynamic security functions and method thereof
EP0969462A1 (en) Recording and reproducing system, recording apparatus and reproducing apparatus having copy protection function
US6310956B1 (en) Copy protection apparatus and method
US7079752B1 (en) Process for recording a scrambled MPEG stream
US6611534B1 (en) Stream data processing system and stream data limiting method
US20030061477A1 (en) Method and apparatus for encrypting media programs for later purchase and viewing
US6674858B1 (en) Receiving device, recording and reproducing device and receiving/recording-reproducing system for digital broadcast signal
US6944296B1 (en) Video bit scrambling
EP0763936A2 (en) Illegal view/copy protection method and apparatus for digital broadcasting system
US6804453B1 (en) Digital signal recording/reproducing apparatus
US7146501B2 (en) Method and apparatus for encrypting and decrypting data using encrypting key contained in electronic watermark
US5461674A (en) Method and apparatus for controlling playback of recorded HDTV signals