JP2002281476A - Digital broadcasting limited receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with a plurality of limited receiving methods and also improve confidentiality by enciphering and decoding an internal signal. SOLUTION: A digital broadcasting limited receiver is provided with two kinds of descramblers, while an enciphering function is attached to one descrambler, and with a decision controlling part for controlling the selection of the two kinds of descramblers and the processing of a decoding part in accordance with the existence/non-existence of enciphering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention receives a scrambled compressed video / audio stream (compressed video / audio stream) sent by digital broadcasting, de-scrambles the video, and reproduces the video / audio. And a digital broadcast conditional access apparatus.

[0002]

2. Description of the Related Art Conventional digital broadcasting limited receiving apparatuses include, for example, Japanese Patent Application Laid-Open Nos.
The one described in JP-A-234647 is known.

[0003] A conventional general digital broadcasting limited receiving apparatus will be described below with reference to FIG.

FIG. 8 shows a system configuration of a conventional general digital broadcasting limited receiving apparatus, which comprises a front end section 801, a descrambler section 802, and a decoder section 803.

[0005] First, in the front end section 801, after selecting a signal input to the digital broadcasting limited receiving apparatus according to frequency, digitally demodulating and error correcting the modulated signal, and then scrambling. The data is output to the descrambler unit 802 as a transport stream.

[0006] Next, the descrambler section 802 converts the scrambled transport stream into scrambled program data, a scramble key encrypted as program information (ECM), and individual information (EMM).
If the program to be received matches the contract, the work key is stored in the digital broadcast limited receiving apparatus by means of an IC card or the like. Is decrypted, the scramble key is decrypted with the decrypted work key, and the program data is descrambled with the decrypted scramble key. As a result, the transport stream is descrambled and transmitted to the decoder unit 803. Output.

[0007] Finally, the decoder section 803 selectively separates predetermined compressed video and audio data from the transport stream, decodes the video and audio, and outputs the uncompressed AV data to the display device and the speaker. Output to

[0008]

However, in the above-mentioned digital broadcasting limited receiving apparatus, there is a receiving apparatus dedicated to digital BS broadcasting and a receiving apparatus dedicated to digital CS broadcasting. No one supports both conditional access systems.
Since only the limited conditional access system can be supported, if the conditional access system is different, the descrambler unit must be replaced.

The descrambled internal signal output from the descrambler has low confidentiality. However, if the output signal of the descrambler is improperly received, the conditional access function is disabled. There was also a fear that.

[0010]

In order to solve the above-mentioned problems, according to the present invention, there are provided a plurality of kinds of descrambler means in which an encryption function is added to one of descrambler means, and a selection of the plurality of kinds of descrambler means. It is configured to provide a determination control means for controlling the processing of the decryption means according to the presence or absence of encryption.

[0011] This makes it possible to cope with a plurality of conditional access systems and to enhance the confidentiality by encrypting and decrypting the internal signal.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A digital broadcasting limited receiving apparatus according to the first invention of the present application inputs a scrambled compressed video / audio stream, and descrambles and outputs scrambled scrambled data if the scrambled data is designated. Descrambler means; AV output encryption means for inputting the compressed video / audio stream from the first descrambler means, performing encryption processing and outputting an encrypted compressed video / audio stream; A second descrambler for inputting the compressed video / audio stream and descrambled if the data is designated scrambled data, and output from the AV output encryption means and the second descrambler. Judge which of the two compressed video / audio streams is valid, and select a valid compressed video / audio stream. Determination control means for outputting and outputting a determination result signal; and receiving the compressed video / audio stream from the determination control means, and controlling the compressed video / audio based on the control of the determination result signal from the determination control means. Decryption means for outputting a non-encrypted compressed video / audio stream by decrypting only when the stream is encrypted and bypassing when the stream is not encrypted.

Here, the expression of the first descrambler means and the second descrambler means is used for the descrambler means, but this does not limit the number of the descrambler means, but a plurality of kinds of descrambler means. It means that the descrambler means is present. The number of the first descrambler means may be singular or plural. The number of the two descrambler means may be singular or plural. Such an interpretation is the same in the following.

The operation according to the first invention is as follows. Since a plurality of the first descrambler and the second descrambler are provided as the descrambler, a plurality of conditional access systems can be supported.

[0015] The compressed video / audio stream for which unauthorized capture is to be prohibited is descrambled by the first descrambler means and then subjected to encryption processing in the AV output encryption means to become an encrypted compressed video / audio stream. It is output to the judgment control means. The compressed video / audio stream that does not need to be prohibited from unauthorized capture is directly output from the second descrambler unit to the determination control unit. The determination control means selects a valid one of the plurality of input compressed video / audio streams and outputs the selected compressed video / audio stream to the next decoding means. At this time, the determination control means also outputs a determination result signal indicating whether or not the output compressed video / audio stream is encrypted to the decryption means. The decoding unit that receives the compressed video / audio stream performs a process according to the determination result signal. That is, a decryption process for decrypting the encrypted compressed video / audio stream is performed, and the unencrypted compressed video / audio stream is directly passed through by bypass. As a result, it is possible to receive video / audio streams of any of the conditional access systems. Nevertheless, the confidentiality of the compressed video / audio stream for which illegal capture should be prohibited can be ensured by encrypting the internal signal.

A digital broadcast conditional access apparatus according to a second aspect of the present invention includes a descrambler for inputting a scrambled compressed video / audio stream, descrambled scrambled data if the scrambled data is designated, and outputting the descrambled data. The above-mentioned compressed video / audio stream is input from the rambler means, and the encrypted video / audio stream is output after being subjected to an encryption process, and the compressed video / audio stream which has been format-converted for communication is received. A receiving unit for demodulating and outputting a normal compressed video / audio stream, and determining which of the two compressed video / audio streams output from the AV output encrypting unit and the receiving unit is valid. Determination control means for selecting and outputting a valid compressed video / audio stream and outputting a determination result signal; The compressed video / audio stream is input from the determination control unit, and based on the determination result signal from the determination control unit, only when the compressed video / audio stream is encrypted, the decryption process is performed. When there is no compressed video / audio stream, a decryption unit is provided for outputting an unencrypted compressed video / audio stream by bypassing.

The operation of the second invention is as follows. Separately from the descrambler means, it has a receiving means for receiving a compressed video / audio stream whose format has been converted for communication, demodulating it into a normal compressed video / audio stream, and outputting it. Can respond.

The compressed video / audio stream for which unauthorized capture is to be prohibited is descrambled by the descrambler, and then subjected to encryption processing in the AV output encrypting means, and is determined as an encrypted compressed video / audio stream. Is output to On the other hand, the normal compressed video / audio stream demodulated by the receiving means is directly output to the judgment control means. The determination control means selects a valid one of the plurality of input compressed video / audio streams and outputs the selected compressed video / audio stream to the next decoding means. At this time, the determination control means also outputs a determination result signal indicating whether or not the output compressed video / audio stream is encrypted to the decryption means. The decoding unit that receives the compressed video / audio stream performs a process according to the determination result signal.
That is, a decryption process for decrypting the encrypted compressed video / audio stream is performed, and the unencrypted compressed video / audio stream is directly passed through by bypass. As a result, it is possible to receive video / audio streams of any of the conditional access systems. Nevertheless, the confidentiality of the compressed video / audio stream for which illegal capture should be prohibited can be ensured by encrypting the internal signal.

[0019] The digital broadcast conditional access apparatus of the third invention of the present application includes a first descrambler means for inputting a scrambled compressed video / audio stream, and descrambling and outputting scrambled data if the scrambled data is designated. , The compressed video data from the first descrambler means.
An AV output encryption means for inputting an audio stream and performing encryption processing to output an encrypted compressed video / audio stream, and a scrambled compressed video / audio stream and scrambling if specified scrambled data Second descrambler means for canceling and outputting
Receiving means for receiving a compressed video / audio stream that has been format-converted for communication, demodulating the compressed video / audio stream into a normal compressed video / audio stream, outputting the AV output encrypting means, the second descrambler means, Determination control means for determining which of the three compressed video / audio streams output from the receiving means is valid, selecting and outputting a valid compressed video / audio stream, and outputting a determination result signal; Means for inputting the compressed video / audio stream, and based on the control of the determination result signal from the determination control means, performs decryption processing only when the compressed video / audio stream is encrypted; In the case of unencrypted compressed video
Decoding means for outputting an audio stream.

According to the third aspect, the function according to the first aspect and the action according to the second aspect are combined.

In the digital broadcast conditional access apparatus according to a fourth aspect of the present invention, in the first to third aspects, the non-encrypted compressed video / audio stream is further input from the decryption means and decoded. Decoder means for outputting AV data is provided. The decoder converts the compressed video / audio stream input from the decoder into reproducible AV data.

In the digital broadcast conditional access apparatus according to a fifth aspect of the present invention, in the first to third aspects, the non-encrypted compressed video / audio stream is further input from the decryption means and is formatted for communication. There is provided a transmitting means for transmitting the compressed video / audio stream after conversion. The transmitting means converts the format of the compressed video / audio stream input from the decoding means for communication, and transmits the converted compressed video / audio stream for communication to the outside.

In the digital broadcast conditional access apparatus according to a sixth aspect of the present invention, in the first to fifth aspects, the compressed video / audio stream is further input from the determination control means, and the compressed video / audio stream is controlled by the determination control means. A storage encrypting unit that performs an encryption process only when the compressed video / audio stream is not encrypted and outputs an encrypted compressed video / audio stream; and an encrypted compressed video / audio stream input from the storage encrypting unit. Adding storage means for storing the audio stream,
The decryption means is configured to perform decryption processing and output a non-encrypted compressed video / audio stream even when the encrypted compressed video / audio stream is input from the storage means.

The operation of the sixth invention is as follows. In addition to the mode in which the compressed video / audio stream output from the determination control means is directly sent to the decoding means as it is, the compressed video / audio stream can be temporarily stored in the storage means and read out from the storage means and used at any desired time. In this case, if the compressed video / audio stream from the determination control means is not encrypted, the compressed video / audio stream is encrypted by the storage encryption means and stored in the storage means. Then, when the encrypted compressed video / audio stream is read from the storage unit, the decryption unit performs a decryption process on the encrypted compressed video / audio stream input from the storage unit to perform the unencrypted compressed video / audio stream. Output a stream. Therefore, even in a mode in which the compressed video / audio stream is temporarily stored, confidentiality can be ensured by encrypting the stored signal.

In the digital broadcast conditional access apparatus according to a seventh aspect of the present invention, in the first to sixth aspects of the present invention, the determination control means may be configured to operate normally by the first descrambler means and the second descrambler means. It is configured to determine based on whether or not descrambling has been performed.

According to an eighth aspect of the present invention, in the digital broadcast conditional access apparatus according to the first to sixth aspects, the determination control means determines whether or not the input compressed video / audio stream is encrypted data. It is configured to determine.

(Specific Embodiment) Hereinafter, a specific embodiment of the digital broadcast conditional access apparatus according to the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a digital broadcast conditional access apparatus according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 101 denotes a first descrambler for descrambling a transport stream which is a scrambled compressed video / audio stream, and 102 denotes a scramble of a conditional access system different from the above. The second descrambler 103 for descrambling the transport stream, which is the compressed video / audio stream, encrypts the transport stream, which is the compressed video / audio stream from the first descrambler 101. And a transport stream 104 from the AV output encryption unit 103 and the second descrambler unit 102.
, Selecting and outputting a valid transport stream from among the transport streams from, determining whether the output transport stream is encrypted, and outputting a determination result signal for controlling the decryption unit 105 The control unit 105 decrypts the encrypted transport stream or bypasses the unencrypted non-encrypted stream transport stream, and the output decryption unit 106 performs the transport stream decoding process. It is a decoder section.

The first descrambler section 101 inputs, for example, a transport stream of a compressed video / audio stream scrambled by the MULTI2 system (ISO 9799/0009) in Japanese digital CS broadcasting, and As shown, the descrambling process is performed according to the contract content, and the transport stream whose scramble has been released is output. That is, the first descrambler unit 101 converts the scrambled compressed video / audio transport stream into scrambled program data and program information (EC information).
M) and the work key encrypted as individual information (EMM) are separated into scramble keys, and if the program to be received matches the contract contents,
The work key is decrypted by a master key stored in the digital broadcast conditional access apparatus by means such as an IC card,
The scramble key is decrypted by the decrypted work key, and the program data is descrambled by the decrypted scramble key. As a result, the data is output as a descrambled transport stream.

The transport stream after descrambling by the first descrambler 101 is
The data is input to the AV output encryption unit 103 and, for example, DES (D
After being encrypted by an encryption method such as ataEncryption Standard (data encryption standard), it is output to the determination control unit 104.

Further, the second descrambler unit 102
The descrambling process is performed in the same manner as in the first descrambler unit 101, but the descrambled transport stream is directly output to the determination control unit 104.

The determination control unit 104 selects and outputs the more effective transport stream from the transport stream from the AV output encryption unit 103 and the transport stream from the second descrambler unit 102. Further, it determines whether or not the selected transport stream is encrypted, and outputs a determination result signal S1 for controlling the decryption unit 105.

Further, the decryption unit 105 decrypts (decrypts) the input transport stream when it is encrypted, and outputs the decrypted transport stream. The decoding and bypass control is performed based on the determination result signal S1 from the determination control unit 104 as described above.

Then, the transport stream output from the decoding unit 105 is input to the decoder unit 106, decoded, and output.

According to the first embodiment, since the first descrambler unit 101 and the second descrambler unit 102 are provided as descrambler means, for example, digital CS broadcast and digital BS broadcast are provided. It is possible to cope with a plurality of conditional access systems as shown in FIG. Then, confidentiality of the compressed video / audio transport stream for which illegal capture should be prohibited can be ensured by encrypting the internal signal. Further, after being converted into AV data by the decoder section 106, the data can be output to a display device / speaker for viewing.

(Embodiment 2) FIG. 2 is a block diagram showing a configuration of a digital broadcasting limited receiving apparatus according to Embodiment 2 of the present invention. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 2, reference numeral 201 denotes a transmission unit for converting the format of a transport stream for communication and transmitting the converted data.

The transport stream output from decoding section 105 is input to transmitting section 201. Transmission unit 20
In step 1, the input transport stream is converted into a format such as packet division for communication, and a packetized transport stream is output.

According to the second embodiment, the first descrambler unit 101 and the second descrambler unit 102 are provided as descrambler means, so that, for example, digital CS broadcast and digital BS broadcast It is possible to cope with a plurality of conditional access systems as shown in FIG. Then, confidentiality of the compressed video / audio transport stream for which illegal capture should be prohibited can be ensured by encrypting the internal signal. Furthermore, the transmission unit 201 can convert the packet into a format such as packet division for communication and transmit the packetized transport stream to the outside.

(Embodiment 3) FIG. 3 is a block diagram showing a configuration of a digital broadcasting limited receiving apparatus according to Embodiment 3 of the present invention. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 3, reference numeral 301 denotes a receiving unit for receiving a transport stream for communication; 302, a transport stream from the encryption unit 103 for AV output;
A determination control unit that selects a valid one of the transport streams from the reception unit 301, determines whether encryption is performed, and outputs a determination result signal S1 for controlling the decryption unit 105. is there.

The receiving section 301 receives a transport stream that has been packetized for communication, converts the transport stream into a normal transport stream, and outputs it to the decision control section 302.

The determination control unit 302 receives the transport stream from the AV output encryption unit 103 and the reception unit 301
A valid stream is selected from among the transport streams from, and output to the decoding unit 105. After that, the decoding unit 10
5. The decoder unit 106 performs the same processing as in the above embodiment, and outputs AV data.

According to the third embodiment, separately from the descrambler section 101, a compressed video / audio transport stream that has been format-converted for communication is received and demodulated into a normal compressed video / audio transport stream. Since the receiver 301 is provided, the receiver can support a plurality of conditional access systems such as digital CS broadcast and digital BS broadcast. Then, confidentiality of the compressed video / audio transport stream for which illegal capture should be prohibited can be ensured by encrypting the internal signal. Further, A
After being converted to V data, it can be output to a display device / speaker for viewing.

(Embodiment 4) FIG. 4 is a block diagram showing a configuration of a digital broadcast limited reception apparatus according to Embodiment 4 of the present invention. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 4, reference numeral 401 denotes a transport stream from the AV output encryption section 103 and a transport stream from the second descrambler section 102 which select and output a valid transport stream. A determination control unit that determines whether or not the transport stream to be output is encrypted, and controls a decryption unit 105, a storage encryption unit 402 described below, and a switch 404 described below. The storage control unit 402 encrypts the transport stream for storage. An encryption unit 403, a storage unit for storing the encrypted transport stream, and 404 a determination control unit 4
01 from the transport stream from the storage unit 403 and the transport stream from the storage unit 403.
This switch is used to select whether to output the data to the address 05.

The transport stream output from the judgment control unit 401 is input to the storage encryption unit 402 or the switch 404. The storage encrypting unit 402 encrypts and outputs the input transport stream if it is not encrypted, and bypasses and outputs it if it is encrypted. The control of the encryption and the bypass is performed by the determination control unit 401. The encrypted transport stream is stored in a storage unit 403 such as a hard disk.
Is accumulated in

Next, the switch 404 is normally set so as to output the transport stream from the first descrambler 101 or the second descrambler 102.

Here, when extracting the encrypted transport stream stored in the storage unit 403, the switch 404 is set to output the transport stream from the storage unit 403 in accordance with an instruction from the determination control unit 401. Is done.

According to the fourth embodiment, the judgment control unit 4
01 directly outputs the compressed video / audio transport stream output from the decoding unit 10 via the switch 404 as it is.
In addition to the mode of sending to S.5, the data can be temporarily stored in the storage unit 403 and read out from the storage unit 403 for use at any desired time. In this case, if the compressed video / audio transport stream is not encrypted, it is stored in the storage unit 403 after being subjected to encryption processing in the storage encryption unit 402, so that confidentiality can be ensured.

(Embodiment 5) FIG. 5 is a block diagram showing a configuration of a digital broadcasting limited receiving apparatus according to Embodiment 5 of the present invention. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 5, reference numeral 501 denotes a valid transport stream among the transport stream from the AV output encryption unit 103, the transport stream from the second descrambler unit 102, and the transport stream from the reception unit 301. It is a determination control unit that selects and outputs the transport stream, determines whether or not the transport stream to be output is encrypted, and controls the decryption unit 105, the storage encryption unit 402, and the switch 404.

FIG. 5 is integrated as a mere combination of FIGS. 1 to 4, and a description of the operation of the determination control unit 501 will be omitted.

(Embodiment 6) FIG. 6 is a block diagram showing a configuration of a digital broadcasting limited receiving apparatus according to Embodiment 6 of the present invention. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 6, reference numeral 601 denotes a MULTI2 system (for example, ISO 997) in digital CS broadcasting in Japan.
9/0009), the first descrambler unit 602 that descrambles the transport stream that is the compressed video / audio stream scrambled and outputs a descrambling signal S2 indicating whether or not the descrambling has been performed normally is the same. A descrambling signal S2 indicating whether or not the descrambling of the scrambled transport stream which is the compressed video / audio stream has been successfully canceled.
The second descrambler unit 603 that outputs a valid stream among the transport stream from the AV output encryption unit 103 and the transport stream from the second descrambler unit 602 based on the release determination signal S2. A switch 604 for selecting and outputting the other transport stream decrypts the encrypted transport stream or bypasses the unencrypted transport stream based on the release determination signal S2 and outputs the decrypted transport stream. Department.

The transport stream is transmitted to the first descrambler unit 601 or the second descrambler unit 60.
One of the two is normally descrambled. At this time, the descrambler unit 601 and the descrambler unit 602 generate a descrambling determination signal indicating whether or not scrambling has been normally performed. Here, if the descrambler is normally descrambled by the first descrambler unit 601, the descrambled transport stream is encrypted by the AV output encryption unit 103 using an encryption method such as the DES method. 603 is output. A transport stream that has not been descrambled normally is output from the second descrambler unit 602, and is input to the switch 603.

Then, the switch 603 outputs the transport stream from the AV output encryption unit 103 based on the descramble determination signal S2 from the first descrambler unit 601 indicating that the descrambling has been normally performed.

Conversely, if the descrambling is normally canceled in the second descrambler unit 602, the switch 6
03, the switch 603 outputs the transport stream from the second descrambler unit 602 based on the release determination signal S2 from the second descrambler unit 602.

The decryption determination signal S2 can be used for decryption and bypass control in the decryption unit 604 by adding information on the presence or absence of encryption.

(Embodiment 7) FIG. 7 is a block diagram showing a configuration of a digital broadcasting limited receiving apparatus according to Embodiment 7 of the present invention. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 7, reference numeral 701 denotes a judgment control unit for judging which of two input transport streams to output,
Reference numeral 2 denotes a decryption unit that decrypts the encrypted transport stream.

First, it is determined whether or not the two transport streams input to the determination control unit 701 are encrypted. As a determination method, for example, there is a method of detecting whether the synchronization byte (47h) of the transport stream appears periodically. Then, it selects and outputs which transport stream to output based on the determination result.

Then, the decryption unit 702 decrypts the input encrypted transport stream and outputs it.

[0065]

As described above, according to the present invention, a plurality of types of descramblers having an encryption function added to one of the descramblers and the selection of the plurality of types of descrambler means and the presence or absence of encryption are determined. By providing the determination control means for controlling the processing of the decryption means, it is possible to obtain an advantageous effect that it is possible to cope with a plurality of conditional access systems and to enhance the confidentiality by encrypting and decrypting the internal signal. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a digital broadcast conditional access apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a digital broadcast conditional access apparatus according to a second embodiment of the present invention;

FIG. 3 is a block diagram showing a configuration of a digital broadcast conditional access apparatus according to a third embodiment of the present invention;

FIG. 4 is a block diagram showing a configuration of a digital broadcast conditional access apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a digital broadcast conditional access apparatus according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a digital broadcast conditional access apparatus according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a digital broadcast conditional access apparatus according to a seventh embodiment of the present invention;

FIG. 8 is a block diagram showing a configuration of a conventional digital broadcast conditional access apparatus.

[Explanation of symbols]

101, 601 First descrambler section (descrambler means) 102, 602 Second descrambler section (descrambler means) 103 AV output encryption section (AV output encryption means) 104, 302, 401, 501 701 Judgment control unit (judgment control unit) 105, 702 Decryption unit (decryption unit) 106 Decoder unit (decoder unit) 201 Transmission unit (transmission unit) 301 Reception unit (reception unit) 402 Storage encryption unit (storage encryption unit) ) 403 storage unit (storage means) 404, 603 switch

Continued on the front page F term (reference) 5C064 CA14 CB01 CC04 5J104 AA01 BA03 PA05 5K028 AA06 AA14 BB04 CC05 DD01 DD02 EE03 EE08 KK23 SS17 SS21

Claims (8)

[Claims] 1. A first descrambler for inputting a scrambled compressed video / audio stream and descrambled if it is designated scrambled data, and outputting the descrambled data. Input video and audio streams, encrypt and process
AV output encrypting means for outputting an audio stream, second descrambler means for inputting a scrambled compressed video / audio stream, and descramble and outputting the scrambled data if designated scrambled data; It is determined which of the two compressed video / audio streams output from the output encryption means and the second descrambler means is valid, and a valid compressed video / audio stream is selected and output. A determination control unit for outputting, the compressed video / audio stream being input from the determination control unit, and the compressed video / audio stream being encrypted based on control of a determination result signal from the determination control unit; By decrypting only the compressed video and audio streams, Digital broadcasting limited reception apparatus characterized by comprising a decoding means for outputting the over arm. 2. A descrambler for inputting a scrambled compressed video / audio stream, descrambled if the data is designated scrambled data, and outputting the compressed video / audio stream from the descrambler. AV encryption means for outputting an encrypted compressed video / audio stream by performing an encryption process; and receiving a compressed video / audio stream that has been format-converted for communication and demodulating it into a normal compressed video / audio stream. Receiving means for outputting the compressed video / audio stream, selecting which of the two compressed video / audio streams output from the AV output encrypting means and the receiving means is valid, and selecting a valid compressed video / audio stream. Determination control means for outputting a determination result signal at the same time as outputting the compressed video / audio stream from the determination control means. Input, and decrypts only the compressed video / audio stream based on the determination result signal from the determination control means if the compressed video / audio stream is encrypted. Decoding means for outputting a compressed compressed video / audio stream. 3. A first descrambler means for inputting a scrambled compressed video / audio stream and descrambled and outputting scrambled data if the data is designated scrambled data. Input video and audio streams, encrypt and process
An AV output encryption means for outputting an audio stream, a second descrambler means for inputting a scrambled compressed video / audio stream, and descrambled and outputting scrambled data if designated scrambled data; Receiving means for receiving a compressed video / audio stream whose format has been converted to a format, demodulating the compressed video / audio stream into a normal compressed video / audio stream, outputting the AV output encrypting means, the second descrambler means, and the receiving means A determination control unit that determines which of the three compressed video / audio streams output from is valid, selects and outputs a valid compressed video / audio stream, and outputs a determination result signal; and The compressed video / audio stream is input, and based on the control of the determination result signal from the determination control means, Decoding means for outputting a non-encrypted compressed video / audio stream by decoding only when the compressed video / audio stream is encrypted, and bypassing when the encrypted video / audio stream is not encrypted. Digital broadcast conditional access device. 4. The apparatus according to claim 1, further comprising a decoder for inputting said non-encrypted compressed video / audio stream from said decoding means, for decoding and outputting AV data. Item 4. A digital broadcast limited reception device according to any one of items 3 to 3. 5. A transmitting means for inputting the non-encrypted compressed video / audio stream from the decrypting means, converting the format for communication, and transmitting the compressed video / audio stream. The limited digital broadcast receiving apparatus according to claim 1, wherein 6. A compressed video / audio stream is inputted from said judgment control means, and under the control of said judgment control means, encryption processing is performed only when said compressed video / audio stream is not encrypted. Storage / encryption means for outputting a video / audio stream; and encrypted / compressed video / audio data input from the storage / encryption means.
Storage means for storing an audio stream, wherein the decryption means performs decryption processing and outputs an unencrypted compressed video / audio stream even when the encrypted compressed video / audio stream is input from the storage means. The digital broadcast conditional access apparatus according to any one of claims 1 to 5, characterized in that the apparatus is configured to perform the above operation. 7. The apparatus according to claim 1, wherein said determination control means determines whether said first descrambler means and said second descrambler means have successfully performed descrambling. Digital broadcast limited reception device according to any one of the above. 8. The apparatus according to claim 1, wherein said determination control means determines whether the input compressed video / audio stream is encrypted data.
Digital broadcast limited reception device according to any one of the above.