KR20030064618A - Prevention of cd-audio piracy using sub-code channels - Google Patents

Abstract

The present invention discloses a method for protecting data recorded on the original storage medium 20 from duplication using an unauthorized data decryption apparatus. The data receives data coded according to standard 908 of the International Electrotechnical Commission. A portion of the coded data for introducing a modification to the sub-code Q channel of the data is changed so that the changed data does not coincide with the implementation of standard 908 used in the data decryption apparatus and does not prevent reproduction of the next data record. The data containing the changed data is written to the original storage medium so that the application of reproducing the recorded data is made in such a way that it is substantially unaffected by the change of the data, and an error that is not substantially recovered is Occurs upon authorized duplication.

Description

Compact disc-voice intrusion prevention using sub-code channels {PREVENTION OF CD-AUDIO PIRACY USING SUB-CODE CHANNELS}

The present invention generally relates to the protection of intellectual property rights and, more particularly, to the prevention of unauthorized duplication of computer readable media of recorded speech.

The present invention is a CIP applicant of U.S. Patent Application No. 09 / 370,813 filed August 9,1999, which is a Continuation-In-Part (CIP) Application of U.S. Patent Application No. 09 / 175,255, filed Oct. 20, 1998. US Patent Application No. 09 / 549,820, filed April 14,2002, and pending. All of the above applications are assigned from the assignee of the present patent application and are incorporated herein by reference.

1 is a schematic sectional view of a compact disc (CD) according to a recording practiced in the prior art.

2 is a schematic block diagram showing an apparatus for producing a copy protection CD according to a preferred embodiment of the present invention.

3 is a schematic diagram showing details of a data structure written on a CD according to a conventionally performed recording.

4 is a block diagram schematically illustrating the copying of data onto a CD for preventing unauthorized copying according to a preferred embodiment of the present invention.

Compact disc (CD) recording is a preferred means for distributing digital voice recording and computer software. CD audio recordings are made in accordance with the International Electrotechnical Commission (IEC) Standard 908 (Geneva, 1987, Switzerland) under the name "Compact Disc Digital Audio System", hereby incorporated by reference. The 908 standard, also known as Red Book, defines how voice data is encoded and written to disk, allowing data to be played back using standard digital decoding chips. In addition, other standards apply to other data types such as computer software that can be recorded on a CD. For example, the Blue Book standard defines a multi-session recording that combines voice and other data on a single disk.

The original music CDs are produced by molding plastic blinks with master stamp pieces produced using expensive special equipment, or where recordable CDs (CDRs) are certified at the request of the customer. Can be created by Because of the expensive CD recording devices, until recently CD recordings were considered relatively reliable, preventing unauthorized copying. As inexpensive CD burners and read / write media have been used by customers, this situation has recently changed. Therefore, it is now easy to accurately digitally copy all types of CDs using a read / write CD drive or a conventional personal computer with one write drive or one read drive. From a single CD, typically the first legally purchased CD, the contents of the CD are read into the computer byte by byte and written on a blank CD for intrusive duplication. Similar duplication methods can be used for other media, such as digital media discs. The financial losses to the recording and software industries due to these infringing copies are estimated at hundreds of millions of dollars.

Another common method of invasive duplication is through the digital audio output provided by many CD players, such as the S / PDIF (Sony / Phillips Digital Link Format) output. This output format is specified by the IEC standard 958 (Geneva, Switzerland, 1993) under the name "Digital Voice Interface", which is incorporated herein by reference. The S / PDIF output can be legally used to connect a CD player to high quality converters, speakers, and other audio components. On the other hand, since the audio content of the CD is played bit by bit, the S / PDIF output is easily used for illegal duplication by intruders. By audio content, the S / PDIF data includes a sub-code, known as a serial copying management system (SCMS), indicating whether the data source is the original recording source or replica. According to SCMS, commercially available recording devices do not allow users to record audio from the S / PDIF flow, which is marked as duplicate. However, this protection is easily avoided by infringing replicators.

It is an object of some embodiments of the present invention to provide an improved method and apparatus for preventing unauthorized copying of a media that can be read by a recorded computer.

Another object of some embodiments of the present invention is to provide a method and apparatus for manufacturing a compact disc that prevents unauthorized copying.

Yet another object of some embodiments of the present invention is to provide a method and apparatus for preventing unauthorized digital copying of an audio disc.

In a preferred embodiment of the present invention, the signals recorded in the first storage means are protected from unauthorized duplication by changes made in the sub code channel, preferably the Q channel. For this purpose, the data writing device comprises a coded block for receiving and encoding audio signals in accordance with IEC standard 908. The modification-insertion block of the data writing device alters the coded signals by introducing a modification into the subcode Q channel of the coded signals. The recording block of the data writing device substantially records the altered signals on a storage medium that typically includes a compact disc (CD).

Preferably, the modified signals result in an error according to the standard used for the standard 908 or CD-ROM drive. Nevertheless, however, the modified signals do not prevent reproduction of the audio signal from the original media recording. Therefore, the original CD can be executed in a manner that is not substantially affected by the change. In contrast, if unauthorized copying of the CD is attempted, the change results in a substantially unrecoverable error. This error may be evident so that no unauthorized copy is produced at all, or the copy is bought so that it is not actually used. Preferably, the authorized software of the data writing device or other hardware allows the CD to be copied so that the authorized copy can be reproduced and not affected by the change.

In other preferred embodiments of the present invention, the change-insertion block inserts a modification into the sub code Q channel by specifying a modified absolute or relative time of the audio signal recorded on the CD. Conventionally known CD copy algorithms are determined by unpurchased track times and do not allow unauthorized copying of a CD prepared with the use of these embodiments of the present invention. Optionally, the original track time is stored on the first CD in the stored bits of the sub code channels defined by standard 908. Authorized copy software retrieves the bits of the subcode from the stored bits, enabling complete copying of the original CD.

Alternatively or additionally, a modification may be introduced by adding one or more additional sessions on the disc with a lead line representing tracks in the program area of the first session, the modification being a special mode for the unauthorized computer to block reading of the session. Include them.

Alternatively or additionally, the modification-insertion block inserts the modification into the sub code Q channel by specifying the changed index number of the track of the audio signals recorded on the CD. Conventionally known CD copy algorithms are determined by unpurchased track times and do not allow unauthorized copying of a CD prepared with the use of these embodiments of the present invention.

Optionally, the initial index number of the track is stored on the first CD in the stored bits of the sub code channels defined by standard 908. Authorized duplication software retrieves the index number of tracks from the stored bits on the disc or from the second session, allowing for complete duplication of the original CD.

Preferably, the original content is typically digitally compressed by compressing the content (using a suitable known format such as MP3 or VQF) and encrypting it so that an authorized personal computer (PC) plays the contents of the protected disk. Protected by management (DRM) technology. This encrypted data is stored in a manner hidden in conventional CD drive software, for example in stored sub code channel bits, idle area or retrieval area on a CD or in a second session. This data can preferably be encrypted and reproduced by using authorized software stored in the second session.

More preferably, the modifications introduced into the CD cause a change in the S / PDIF output or other digital output generated by the CD player on which the protected CD is played. The change in digital output does not interfere with the audio reproduction of the CD recorded by a device such as an audio speaker with a digital / analog converter.

However, this change prevents unauthorized duplication of CD contents, for example using digital output such as digital input to a recorder.

Optionally, in addition to the modifications introduced in the sub code channel, other modifications are introduced into the audio data as obstacles intentionally added to unauthorized copying. Modifications are introduced such that incidental data on the disc, such as error detection codes provided by the 908 standard (or other application standard), corrects or hides the modifications upon playback, or ignores them together. However, if unauthorized copying is made of the media, the incidental data is ineffective in overcoming intentional modifications on the original media, resulting in substantially unrecoverable errors upon copying. Methods for introducing such modifications are described in the aforementioned U.S. Patent Application Nos. 09 / 175,255 and 09 / 370,813.

According to a preferred embodiment of the present invention, there is provided a method for protecting data recorded on an initial storage medium from duplication using an unauthorized data decryption device, the data being encoded according to standard 908 of the International Electrotechnical Commission. And a portion of the coded data for introducing a modification to the sub-code Q channel of the data so that the modified data does not match the implementation of standard 908 used in the data decryption device and does not prevent the reproduction of subsequent data records. The application of reproducing the recorded data is made in a manner that is substantially unaffected by the change of the data, including the steps of changing and recording the data containing the changed data to the first storage medium, and the recovery is not substantially recovered. Error that occurs during unauthorized copying of the original storage medium The method as provided.

Advantageously, said medium comprises a compact disc and said data comprises digital audio data.

In a preferred embodiment, the data changing step includes changing an absolute time in the data recorded on the medium. Preferably, the exact absolute time is stored in the sub-code bits stored on the medium. More preferably, the change in absolute time comprises changing absolute times recorded in a plurality of consecutive blocks of the selected track.

In another embodiment, the step of modifying the data includes copying one or more blocks of data to a new location on the storage medium without changing the absolute time recorded in the sub-code channel of the one or more blocks.

In another embodiment, changing the data includes changing a point index in a track of data recorded on the medium. Advantageously, the method further comprises storing the correct absolute time in sub-code bits stored on the medium.

In yet another embodiment, the data changing step comprises generating a multi-session recording comprising audio and data sessions, wherein a change in the sub-code Q channel is introduced in at least one of the sessions. Advantageously, the generation of the multi-session recording comprises creating a lead line in one of the sessions targeting one or more tracks located in the first audio session. Alternatively or additionally, the generation of the multi-session recording includes creating a drop line in one of the sessions containing a large number of tracks specified by the standard. Additionally or alternatively or in addition, the generation of the multi-session recording includes creating a lead line in one of the sessions representing a substantially shorter recording medium. Additionally or alternatively or additionally, the generation of the multi-session recording includes inserting a changed absolute time at the start of one of the sessions. In addition or alternatively or in addition, the generation of the multi-session recording includes creating at least two multi-sessions recognized as audio sessions.

In one preferred embodiment, the data recording step comprises compressing and storing the data on the medium in a data session for authorized duplication of the medium.

In another preferred embodiment, the coded data comprises coded audio data, the method modifying a portion of the coded audio data such that the modified data is recognized as inconsistent with the implementation of standard 908 used in the data decryption apparatus. And recording the data on the medium by the processor such that the application reproduces the data in a manner that is substantially unaffected by a change of the coded audio data in an application executed on a modified portion of the coded audio data. Recording the minor data to be used, but the minor data causes the modified portions of the coded audio data to be copied upon copying of the data such that the change further causes a substantially unrecoverable error upon unauthorized copying of the original medium. To correct It is come ineffective.

Preferably, the incidental data includes error detection codes.

According to a preferred embodiment of the present invention, there is provided a method for protecting data recorded on an original storage medium from unauthorized copying, the method comprising: receiving data encoded according to standard 908 of the International Electrotechnical Commission meeting; Altering a portion of the coded data for introducing a correction into the data and altering the data so that the digital output of the data does not coincide with the implementation of standard 958 of the International Electrical Standards Conference but the correction does not prevent the reproduction of the next data record. Recording the data including the data to the first storage medium, wherein the application for reproducing the recorded data is made in a manner that is substantially unaffected by the change of the data; It further provides a method characterized by what happens upon unauthorized copying of do.

Advantageously, the step of changing a portion of the coded data comprises changing one or more control bits in the coded data in which the control bits are reproduced at the digital output.

Additionally or alternatively, the step of modifying the portion of coded data includes manipulating bits of audio data within a frame of coded data.

According to another preferred embodiment of the present invention, an apparatus for protecting data recorded on an original storage medium from duplication using an unauthorized data decryption device, the method comprising: recording on a medium according to standard 908 of the International Electrotechnical Commission. An encoder employed to receive a data flow for and to encode the data; Operate to change a portion of the coded data by introducing a modification of the sub-coded Q channel of the data so that the changed data does not match the practice of standard 908 used in the data decryption device and does not prevent the reproduction of subsequent data records. Sub-code generator; And an 8-14 eight-to-fourteen bit modulator (EMF) for modulating the modified data for writing to the original storage medium,

An application is provided in which the application of reproducing the recorded data is made in a manner that is substantially unaffected by the change of the data, wherein an error that is substantially unrecovered occurs upon unauthorized copying of the original storage medium. .

In one preferred embodiment, the apparatus writes to an initial storage medium such that data recorded on the medium comprises multiple sessions, and a defect in a sub-code Q channel is introduced into at least one of the multiple sessions. A data session generator operative to provide a data session to the EFM for the purpose.

According to another preferred embodiment of the present invention, in a data storage medium which prevents duplication using an unauthorized data decryption device, the media data encoded according to the standard 908 of the International Electrotechnical Commission is stored therein, and the modified data A portion of the coded data is changed by introducing a modification of the sub-code Q channel of the data so as not to prevent the reproduction of the next data record so as not to coincide with the implementation of standard 908 used in the data decryption apparatus, so that the recorded data is changed. There is further provided a medium in which the playing application is made in a manner that is substantially unaffected by changes in the data, and wherein substantially unrecoverable errors occur upon unauthorized copying of the original storage medium.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Reference is made to FIG. 1, which is a schematic cross-sectional view of an audio compact disc 20, showing the overall layout of the disc, according to a recording practiced in the prior art. The information area 22 includes a retraction (LI) area 24, a program area (PA) 26, and a retrieval (LO) area 28. The information area 22 faces the outside in a wider spiral structure, and includes both P and Q channels that contain timing and track information used during CD playback. The program area 26 not only accompanies the sub-code information but also contains up to 99 tracks of audio information such as music.

Preferred embodiments of the present invention provide several different complementary techniques for modifying data in CD 20 to prevent infringing replicators.

Many of these embodiments are described in detail below. Generally speaking, modifications fall into the following categories.

General disc layout modification, eg recording of several sessions to an audio CD: The second session typically misuses the personal computer commonly used for invasive duplication by adding collision pointers to the lead of the second session. It can be used to Preferably, the last session of the CD is a data session that includes music in a compressed format. More preferably, the music is encrypted so that it can be played or coded directly from the disc using digital packaging technology (digital rights management (DRM)) to enable download and playback through authentic software from the disc of an authorized user. .

The modification of the audio data by the insertion of noise is preferably as described in the above-mentioned US Patent Application No. 09 / 370,813.

In particular the modification of subcode information in the Q channel: such modifications may be for example absolute or relative changes in time, index points, tables of contents (TOC), information (enumeration of too many or too few tracks, pointers between multiple sessions) Mishandling), control byte modifications, and pregap length adjustment. Other modifications will be apparent to those skilled in the art.

Low level modifications to the structure of the bits recorded on the CD: These modifications are described in the above-mentioned US patent application Ser. No. 09 / 370,813. These modifications typically involve writing consecutive bits on a CD that cause hardware failures in some CD-ROM drives used in PCs or prevent them from inserting faulty audio data. Alternatively or in addition to this, the bit sequences may be recorded on a CD which does not appear in the conventional 8-14 bit-modulator (EMF) lookup table specified by the 908 standard.

These modifications can be used in the CD 20 in different combinations depending on the intended use.

2 is a schematic block diagram illustrating an apparatus 40 for producing a copy protection CD according to a preferred embodiment of the present invention. The original sound, or analog audio, is converted into a digital format suitable for encoding on a disc so that the information can be reproduced (decoded) by a standard player of the audio CD 20. In the first stage of encoding, a digital bit flow is generated that represents a continuous analog sound signal. The analog signal is converted into detailed digital samples by the analog-to-digital converter 30.

Parity bits are added to the bit flow to enable detection and correction of errors during playback. The error correction encoder 32 employs a Cross-Interleaved Reed-Solomon Code (CIRC), which is commonly used to record digital data. The sub code generator 36 adds bytes of the sub code for all 32 bytes of error correction audio. The 908 standard estimates that the contents of the sub code channels will be added at this stage. However, the sub code generator 36 changes the standard sub codes in such a way that normal reproduction of the CD is substantially unaffected and unauthorized copying is prevented. In particular, this change does not include the integration of bit flows and does not cause CIRC errors on the disk.

The method of this change is described below.

Apparatus 40 is also shown to include an optional data session generator 37 for producing multi-session discs including audio and data sessions. As described below, a data session is established to prevent unauthorized computers from reading the CD. Audio compressor 35 is optionally provided to compress the audio output for inclusion in a multi-session disc in coded format.

Standard 16-bit words of sound data are arranged with two 16-bit selective codes, and the inclusion into the recording of additional information such as playback control and display functions is well known. The EFM 34 couples the output of the error correction encoder 32 to the outputs of the sub code generator 36 and the data session generator 37. Preferably, each of the coded data is physically engraved using a laser beam recorder (LBR) 38 to create a series of fine pits on the master. Alternatively, burner 39 is used to produce CD 20 directly on a recordable CD (CDR).

3 is a schematic diagram of details of a data structure received by the EFM 34 in accordance with the 908 standard. Block 58 of data for writing to a CD comprises 98 frames, each frame having a 32 byte data sign and one 8 bit sub code word received from encoder 32 (or data session generator 37). Is made of. The eight bits of each sub code word are called P, Q, R, S, T, U, V, and W, respectively.

The Q bits from 90 consecutive frames are collectively called the sub code Q channel 64.

The sub code channel contains program and timing information including synchronization bits SO and SI, four control bits, four address bits, 72 data bits, and a 16-bit cyclic redundancy check code (CRCC). In the lead-in area 24, 72 data bits contain relative time (R-time, or track time) data 74 and track position, while in program area 26, the relative time and absolute time A Time, or disk time) is stored. The relative time for each block represents the length of time from the start of the current track to the start of the block. Absolute time represents the length of time from the beginning of program area 26 to the beginning of the block. The time has 75 time frames per second and is measured in minutes, seconds, and frames (one block different from 98 data frames). The Q channel also includes a track entry index, referred to as track number (TNO) and point indices. In the retraction area 24, the Q channel carries a table of contents TOC.

Table 1 below schematically shows the change of the absolute time values of the sub code Q channel 64 according to a preferred embodiment of the present invention. In typical coding of the CD 20 according to standard 908, the absolute time increases linearly from the beginning of the program area 26 to the end of the retrieval area 28. Duplicate software known in the prior art uses absolute time as a pointer to enable smooth playback of the original audio and synchronization of the timing between the recorded frames and the reproduced frames.

Preferably, a modification is introduced to the absolute time values of the sub code Q channel as shown in the altered column in the table, increasing the time at the rate at which this track passes.

First time Change time minute second frame minute second frame 0 (track) 0 0 0 0 0 0 0 One 0 0 2 0 0 2 0 0 4 0 0 3 0 0 6 0 0 4 0 0 7 0 0 5 0 0 8 ... ... ... ... ... ... 0 0 71 0 0 74 0 0 72 0 One 0 ... ... ... ... ... ... 5 (terminal track) 30 42 5 36 20 5 (pause) 30 43 5 30 43 5 30 44 5 30 44 ... ... ... ... ... ...

Table 1

In order not to adversely affect the stereo reproduction of the audio, the absolute time of the original CD 20 is preferably increased in several consecutive blocks of all 150 consecutive blocks, as shown in the table above, and between tracks. It returns to normal in the resting region of. Standard CD players are not affected by this intentional distortion of absolute time. However, an unauthorized copy of the CD 20 includes discontinuous portions in yin and yang, for example, in the above table, absolute time jumps from frame 2 to frame 4 to frame 6.

Optionally, the original correct absolute time information is stored in the stored bits of the currently unassigned sub code R-W channels 23 according to standard 908. Authorized software makes it possible to make copies of the original CD 20 by accessing the data stored on the R-W channels.

Or, in addition to introducing a correction in absolute time, a correction is introduced into the sub code Q channel 64 by changing the point index and / or mode values, which produces the effect of audio being heard in the unauthorized copy. Like the absolute track time, the point index provides a series of check points within the track. The modified series of point indices results in silent areas upon unauthorized copying of the CD 20 but does not affect the playback of the original CD. Optionally, as noted above, the correct indices are stored in the R-W channel, and unauthorized software allows the copy of the original CD by retrieving the indices from these channels.

Preferably, the modification introduced in the CD results in a change in digital output such as the S / PDIF output generated by the CD player in which the protected CD is played. The digital output data flow includes a sequence of 32-bit words known as subframes, each of which travels between 16 and 24 bits of audio data along with the precursor part and control bits. One of the control bits of each subframe is a subcode bit similar to the subcode bits in each frame of data of the CD. The subcode bits in one block of 192 frames (typically 384 subframes) in the S / PDIF data flow are those of the subcode Q channel played on the CD, including the control byte, track number, and time. Carries most of the details.

Preferably, modifications introduced to the Q channel on the disc are carried in S / PDIF data. This modification does not prevent the audio reproduction of the CD recording by the speakers and the corresponding other devices, but it prevents unauthorized copying of the CD contents using the digital output.

As detailed above in the IEC 958 standard, the S / PDIF signal contains four control bytes copied from the CD. Therefore, in another embodiment of the present invention, these control bytes are used to suppress illegal copying of audio content. For this purpose, when writing control bytes on a CD, according to the Red Book standard, track mode is typically a repetitive cycle in the data for the number of blocks between one block and ten blocks. Is set. The CRCC is then recalculated so that this control byte is valid in terms of data accuracy. However, when recording is made from the S / PDIF output of the CD player, this control byte causes silence or click to appear in the resulting audio flow.

In another embodiment, the bits in S / PDIF are shifted or adjusted to confuse unauthorized recording of CD content. If 32 bits in the S / PDIF subframe are fed to the digital / analog converter for audio reproduction, the converter takes all 32 bits and plays the audio regardless of the shift. However, the digital recorder obtains control data in a given subset of the bits of the subframe. This data is in accordance with the standard. Therefore, adjusting the bit command can block the recorders and still enable audio reproduction.

4 is a block diagram schematically illustrating another method for preventing unauthorized copying of a CD using a data session generator 37, in accordance with a preferred embodiment of the present invention. Whereas the audio CD has a single session 90, the device 4 with the session generator 37 may be a different session, including for example one or more audio sessions 100 and at least one data session 102. Can produce a CD. The audio CD player reads only the first session on the multisession CD and ignores pauses in the case of session 100. DVD players read and recognize data session 102, but still play audio session 100. However, if the CD is inserted into the CD-ROM drive, the computer can access any sessions and is therefore confused by the modifications made in the second or successive sessions. Therefore, this embodiment is implemented by introducing collision data into the subcode Q channel of the data session 102 or additional audio sessions following the first audio session. More preferably, there are at least two audio sessions out of a total of three or more sessions on the disc.

Preferably, the modified data is also introduced to the audio session 100. Incidental data on the disc, such as the CIRC error detection mode provided by the 908 standard (or other application standard), introduces modifications such that the CD player corrects, conceals, or ignores them together during playback. However, if unauthorized copying is made of the media, the incidental data is ineffective in overcoming intentional modifications on the original media, resulting in substantially unrecoverable errors upon copying. Methods for introducing such modifications are described in the aforementioned U.S. Patent Application Nos. 09 / 175,255 and 09 / 370,813.

Despite the modifications in the sub code channels and / or the audio data, the audio CD player reproduces the audio signal on the disc without difficulty. However, a computer CD drive is confusing by multiple sessions on a CD and one (or both) of the changed data in the audio session 100, so that a disc cannot be loaded or played and duplicated.

Preferably, modifications in the added audio and / or data sessions are introduced by one or more of the following mechanisms.

Generation of a drop line representing tracks located in the program area of the first session.

Generation of a lead wire with a greater number of tracks than permitted by the 908 standard.

· Lead line correction to simulate shorter CDs.

Modification of absolute time at the start of the session.

Following these methods, Table 2 shows the changes that are made in the sub code Q channel of a multi-session CD in order to prevent computer duplication of the audio content without disturbing audio reproduction. Due to the Red Book standard, the first session on the CD is an audio session. On the other hand, the second and subsequent sessions due to the Blue Book as described above are audio or data sessions.

Session Standard Modified One Entry (2½-3 minutes) Per Blue Bool format, added to the second and third sessions of pointers BO and CO Pause length (2 seconds) Use of different full gap lengths per bluebook pocket, preferably to set a value between 1 and 3 seconds Accurate A-Time To mask the start of a disc for a computer CE drive, start A-time so that it is not zero, for example 10 seconds. 2 Audio track Audio track length 4 seconds (minimum time per red book) 3 Entry (1 minute) TOC displays 99 nonexistent data tracks at 00:02 Changes the input pointer (A2) to a value between 00:01 and 00:07 Audio track Data track length 4 seconds, also full CD length

TABLE 2

As a result of this change, by reading subcode Q channel data in session 3, the computer CD-ROM or DVD-ROM drive enters a circular loop to find nonexistent data tracks connected to the TOC. If the drive succeeds in accessing the session 1 with normal audio content, it can still be confused by the one second full interval (other than the Revbook specification) and / or by the distorted A-time. However, CD audio and DVD players are not greatly affected by these changes. In this regard, session 2 is important. Without session 2, DVD players due to some blue books refuse to set up a CD. Certain modifications listed in the tables are merely listed by way of example. Other combinations of modifications and settings of time values and other parameters are apparent to those skilled in the art.

Preferably, in order to allow authorized personal computers to play protected disc content, the original content is compressed by an audio compressor (35 in FIG. 2) (using a suitable known format such as MP3 or VQF). Encrypted. This encrypted data is stored using "digital packaging technology" so that the data is hidden from conventional CD drive software. For example, data may be stored in the stored subcode channel bits as described above, or may be stored in a data session on the CD or in an incoming, outgoing, idle area. Preferably, data can be encrypted and played back only by using authorized software stored in the second session and available only to suitably authorized users and / or devices. Authorized software prevents encryption of data if its source is not the original CD or if rules for distributing and using the data are violated.

Since the preferred embodiments of the present invention as described above are merely illustrative, the present invention is not limited to the above shown and described. In addition, the scope of the present invention includes not only combinations or sub-combinations of the various features described above, but modifications and variations thereof are apparent to those skilled in the art.

Claims (42)

A method for protecting data recorded on an original storage medium from duplication using an unauthorized data decryption device, Receiving data coded according to standard 908 of the International Electrotechnical Commission; Modifying a portion of the coded data for introducing a modification to the sub-coded Q channel of the data so that the changed data does not match the practice of standard 908 used in the data decryption device and does not prevent reproduction of the next data record. ; And Recording the data containing the changed data to the first storage medium, The application of reproducing the recorded data is made in a manner that is substantially unaffected by the change of the data, wherein a substantially unrecoverable error occurs upon unauthorized copying of the original storage medium. The method of claim 1 wherein the medium comprises a compact disc. The method of claim 1, wherein the data comprises digital audio data. 2. The method of claim 1, wherein changing the data comprises changing an absolute time in the data recorded on the medium. 5. The method of claim 4, further comprising storing the correct absolute time in sub-code bits stored on the medium. 5. The method of claim 4, wherein changing the absolute time comprises changing absolute times recorded in a plurality of consecutive blocks of a selected track. 2. The method of claim 1, wherein the step of modifying data comprises copying one or more blocks of data to a new location on the storage medium without changing the absolute time recorded in the sub-code channel of the one or more blocks. . 2. The method of claim 1, wherein changing the data comprises changing a point index in a track of data recorded on the medium. 9. The method of claim 8, further comprising storing the correct absolute time in sub-code bits stored on the medium. 2. The method of claim 1, wherein changing the data comprises generating a multi-session record comprising audio and data sessions, wherein a change in a sub-code Q channel is introduced in at least one of the sessions. How to. 11. The method of claim 10, wherein the sessions include a first audio session, and wherein the generation of the multi-session recording comprises creating a drop line in one of the sessions targeting one or more tracks located in the first audio session. How to. 11. The method of claim 10, wherein the generation of the multi-session recording comprises creating a tug in one of the sessions comprising a large number of tracks specified by the standard. 11. The method of claim 10, wherein the change is introduced in both audio and data sessions. 11. The method of claim 10, wherein the generation of the multi-session record comprises inserting a changed absolute time at the start of one of the sessions. 11. The method of claim 10, wherein the generation of the multi-session recording comprises creating at least two multi-sessions recognized as audio sessions. 2. The method of claim 1, wherein recording the data comprises compressing and storing the data on the medium in a data session for authorized copying of the medium. 2. The method of claim 1, wherein the coded data includes coded audio data, the method modifying a portion of coded audio data such that the modified data is recognized as inconsistent with the implementation of standard 908 used in the data decryption apparatus. And recording the data on the medium by the processor such that the application reproduces the data in a manner that is substantially unaffected by a change of the coded audio data in an application executed on a modified portion of the coded audio data. Recording the minor data to be used, but the minor data causes the modified portions of the coded audio data to be copied upon copying of the data such that the change further causes a substantially unrecoverable error upon unauthorized copying of the original medium. Rain in correction Characterized in that the overload. 18. The method of claim 17, wherein said minor data includes error detection codes. 2. The method of claim 1, wherein changing the coded data portion comprises changing the data to change a standard digital output generated from the medium. 20. The method of claim 19, wherein the standard digital output is generated in accordance with standard 958 of the International Electrotechnical Commission. A method for protecting data recorded on an original storage medium from unauthorized duplication, Receiving data coded according to standard 908 of the International Electrotechnical Commission; Modifying a portion of the coded data for introducing a correction in the data such that the digital output of the modified data does not match the implementation of standard 958 of the International Electrotechnical Commission but the modification does not prevent the reproduction of the next data record; And Recording the data containing the changed data to the first storage medium, The application of reproducing the recorded data is made in a manner that is substantially unaffected by the change of the data, wherein a substantially unrecoverable error occurs upon unauthorized copying of the original storage medium. 22. The method of claim 21, wherein the step of modifying the portion of coded data comprises changing one or more control bits in the coded data from which control bits are reproduced upon digital output. 22. The method of claim 21, wherein changing the portion of coded data comprises manipulating bits of audio data within a frame of coded data. An apparatus for protecting data recorded on an original storage medium from duplication using an unauthorized data decryption apparatus, the apparatus comprising: An encoder employed to receive the data flow for writing to the medium and to code the data according to standard 908 of the International Electrotechnical Commission; Operate to change a portion of the coded data by introducing a modification of the sub-coded Q channel of the data so that the changed data does not match the practice of standard 908 used in the data decryption device and does not prevent the reproduction of subsequent data records. Sub-code generator; And Including an eight-to-fourteen bit modulator (EMF) for modulating the modified data for writing to the original storage medium, An application in which recorded data is reproduced in a manner that is substantially unaffected by a change in the data, wherein a substantially unrecoverable error occurs upon unauthorized copying of the original storage medium. 25. The apparatus of claim 24, wherein the medium comprises a compact disc. 25. The apparatus of claim 24, wherein the data comprises digital audio data. 25. The apparatus of claim 24, wherein the modification in the sub-code Q channel comprises a changed value of the absolute time of the track in the data recorded on the medium. 25. The apparatus of claim 24, wherein the modification in the sub-code Q channel is made by copying one or more blocks to a new location on the storage medium without changing the absolute time recorded in the Q channel of one or more blocks. 25. The apparatus of claim 24, wherein the modification in the sub-code Q channel comprises a modified value of a point index in a track of data recorded on the medium. 25. The data of claim 24 wherein the data recorded on the medium comprises multiple sessions and a defect in a sub-code Q channel is introduced into at least one of the multiple sessions. And a data session generator operative to provide a session. 25. The apparatus of claim 24, wherein the coded data includes coded audio data, and wherein the encoder changes the portion of coded audio data to recognize that the modified data does not match the implementation of standard 908 used in the data decryption device. And the recorded data on the medium is used by the processor to be an application that reproduces the data in a manner that is substantially unaffected by a change of the coded audio data in an application executed on a modified portion of the coded audio data. Although the incidental data includes incidental data, it has been found that the incidental data is ineffective in correcting altered portions of coded audio data upon duplication of the data such that the alteration further causes a substantially unrecoverable error upon unauthorized copying of the original medium. Featuring Device. 25. The apparatus of claim 24, wherein a defect in the sub-code Q channel is generated from a medium in accordance with standard 958 of the International Electrotechnical Commission to create a correction in the digital output. An apparatus for protecting data recorded on an original storage medium from unauthorized duplication, It is employed to receive and encode data flows for recording to the medium in accordance with standard 908 of the International Conference on Electrical Standards, while the digital output of the altered data does not match the implementation of Standard 958 of the International Conference on Electrical Standards but is modified. An encoder for changing a portion of coded data for introducing correction into the data so as not to prevent reproduction of this next data record; And Including an eight-to-fourteen bit modulator (EMF) for modulating the modified data for writing to the original storage medium, The application of reproducing the recorded data is made in a manner that is substantially unaffected by the change of the data, wherein a substantially unrecoverable error occurs upon unauthorized copying of the original storage medium based on the digital output. Device. 34. The apparatus of claim 33, wherein changing the portion of the coded data comprises changing one or more control bits in the coded data in which control bits are reproduced at the digital output. 34. The apparatus of claim 33, wherein changing the portion of the coded data includes manipulating bits of audio data within a frame of coded data. A data storage medium that prevents duplication using an unauthorized data decryption device, The media data coded according to standard 908 of the International Electrotechnical Commission is stored therein, so that the subsequent data recording is not prevented so that the changed data does not coincide with the implementation of standard 908 used in the data decryption device. By introducing a modification of the code Q channel, a portion of the coded data is changed, Wherein the application of reproducing the recorded data is made in a manner that is substantially unaffected by the change of the data, wherein an error that is substantially unrecovered occurs upon unauthorized copying of the original storage medium. 37. The medium of claim 36 comprising a compact disc. 37. The medium of claim 36, wherein said data comprises digital audio data. 37. The medium of claim 36, wherein data is encoded in the medium in multiple sessions, including audio and data sessions, wherein a defect is introduced in at least one of the audio and data sessions. 37. The method of claim 36, wherein the data is encoded in the medium in a multi-session format including first and second sessions, the second session comprising data from the first session in a compressed format to authorize the first session to be authorized. Characterized in that the medium. 37. The medium of claim 36, wherein the coded data includes coded audio data, and wherein a portion of the coded audio data is changed to recognize that the modified data does not match the implementation of standard 908 used in the data decryption device. The recorded data on the board includes ancillary data used by the processor to be an application that reproduces the data in a manner that is substantially unaffected by a change of the coded audio data in an application executed on a modified portion of the coded audio data. Media is ineffective in correcting altered portions of coded audio data upon duplication of data such that the change further causes a substantially unrecoverable error upon unauthorized copying of the original media. A data storage medium that prevents unauthorized replication, Media data coded according to Standard 908 of the International Electrotechnical Commission is stored therein so that the digital output of the altered data does not match the implementation of Standard 958 of the International Electrotechnical Commission but the modifications do not prevent the reproduction of the next data record. The coded data has been changed to introduce modifications into The application of reproducing the recorded data is made in a manner that is substantially unaffected by the change of the data, wherein a substantially unrecoverable error occurs upon unauthorized copying of the original storage medium based on the digital output. media.