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Recorder

  • US 7,158,641 B2
  • Filed: 11/29/2000
  • Issued: 01/02/2007
  • Est. Priority Date: 11/30/1999
  • Status: Expired due to Fees
First Claim
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1. A recording device (110) for receiving and recording data encrypted with a first public encryption key (KPm(i)) predetermined with respect to the recording device, and used for decrypting encrypted content data, comprising:

  • a first key holding portion (1421) for holding a first private decryption key (Km(i)) being asymmetric to said first public encryption key and used for decrypting data encrypted with said first public encryption key;

    a first decryption processing portion (1422) for receiving a license key encrypted with said first public encryption key, and decrypting the received data with said first private decryption key;

    a second key holding portion (1450, 1451) for holding at least one secret unique key (K(i)) being unique to said recording device and being symmetric in a symmetric key cryptosystem;

    a first encryption processing portion (1452) for receiving and encrypting said license key again with said secret unique key;

    a recording portion for receiving and storing the output of said first encryption processing portion; and

    a second decryption processing portion (1454) for decrypting said license key stored in said recording portion with said secret unique key.

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