Recording medium, recording apparatus, reading apparatus, and program and method therefor
A recording medium and recording device technology, applied in data recording, recording signal processing, recording information storage, etc., can solve problems such as poor sales and unacceptable personal copying of digital data by users
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no. 2 example
[0140] The focus of the first embodiment above is to protect the CCI from tampering by using the code Dveri. The second embodiment aims at improving the protection of the CCI against its tampering, but without using the code Dveri. This improvement is achieved by generating the content key Kc by the entire CCI instead of just the APSTB.
[0141] Similar to the method in Fig. 7, Fig. 18 shows the encryption process of generating the content key Kc from the entire CCI. According to the present embodiment, although compatibility with devices compliant with existing standards is not maintained, the code Dveri is not used to prevent falsification of the CCI. Assuming that the CCI is changed, the content key Kc generated by the device to decrypt the content is greatly different from the original content key Kc, so that the content will not be correctly decrypted.
[0142] The code Dveri is not required, and the offset of AV data from the time variation coefficient Dtkc is shortene...
no. 3 example
[0144] The purpose of the first and second embodiments is to record an MPEG2-PS format digital stream onto a recording medium. In the third embodiment, the MPEG2-TS format digital stream is recorded on the recording medium.
[0145] MPEG2-TS format digital streams are suitable for recording onto HD or Blu-ray discs.
[0146] First, how to convert the GOP described in the first embodiment into an MPEG2-TS format digital stream once recorded on a recording medium will be described.
[0147] Figure 19 shows the structure of a digital stream recordable on a bluedisk in different levels of increasing detail. In FIG. 19, the first to third levels are the same as those shown in FIG. 2, and show picture strings, GOP segments, and PES packet strings, respectively. The fourth and fifth stages are quite different from those shown in Figure 2. The PES packet string integrated by the GOP string is interlacedly compounded with the PES packet integrated by the audio stream (tj1 shown in t...
no. 4 example
[0194] In the first embodiment, VOBUs are copied from one device belonging to the same home network to another device. In the fourth embodiment described hereinafter, VOBUs are copied in one device.
[0195] Fig. 29 shows the internal structure of the recording apparatus according to the fourth embodiment. In the drawing, one of the drive 1 and the HDD serves as a copy source, and the other serves as a copy destination.
[0196] When copying a VOBU, the stream decryption unit 16 generates a content key Kc and a code Dveri from data stored in the copy source recording medium, and compares the code Dveri thus generated with the code Dveri in the RDI packet. If they match, the stream decryption unit 16 decrypts the encrypted VOBU read from the copy source recording medium using the content key Kc.
[0197] The stream encryption unit 15 generates a content key Kc unique to the copy destination medium, and encrypts the VOBU stored in the buffer memory 3 using the generated conten...
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