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Reproduction device stopping reproduction of encrypted content data having encrypted region shorter than predetermined length

  • US 7,010,809 B2
  • Filed: 09/10/2001
  • Issued: 03/07/2006
  • Est. Priority Date: 03/13/2001
  • Status: Expired due to Fees
First Claim
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1. A reproducing device for decrypting and reproducing encrypted content data divided into a plurality of blocks formed of an encrypted block including encrypted data and a non-encrypted block including non-encrypted data, comprising:

  • a decrypting circuit for detecting whether each of said plurality of blocks is said encrypted block or said non-encrypted block, and operating;

    (1) in the case of the encrypted block, to decrypt said encrypted data and output the resulting non-encrypted data; and

    (2) in the case of the non-encrypted block, to output said non-encrypted data from the non-encrypted block; and

    a control circuit, whereinsaid control circuit receives a result of detection in said decrypting circuit, and stops supplying said block to said decrypting circuit when the number of the detected non-encrypted blocks in said content data is equal to or larger than a predetermined non-zero number.

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