Device for reproducing data

Patent 6898708 Issued on May 24, 2005. Estimated Expiration Date:

December 6, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Sanyo Electric Co., Ltd.

Application

No. 10148191 filed on 12/06/2000

US Classes:

713/171, Having key exchange705/59Licensing

Examiners

Primary: Cangialosi, Salvatore

Attorney, Agent or Firm

Westerman, Hattori, Daniels & Adrian, LLP

Foreign Patent References

000966127 EP 12/01/1999
001150196 EP 10/01/2001
5-75598 JP 03/01/1993
10-40172 JP 02/01/1998
11-154944 JP 06/01/1999
11-265317 JP 09/01/1999
11-306673 JP 11/01/1999

International Classes

H04L009/00
H04L009/32
G06F001/00

Abstract

A cellular phone (100) stores encrypted content data and encrypted license key distributed thereto in a memory card (110). The cellular phone (100) and the memory card (110) collectively perform a part of mutual authentication processing upon power-on. The encrypted license key (Kc) read from the memory card (110) is decrypted by a first decryption processing portion (1510) with a session key (Ks4), and is further decrypted by a second decryption processing portion (1514) with a system symmetric key (Kcom) for extraction. A third encryption processing portion (1516) decrypts the encrypted content data read from memory card (110) with the license key (Kc) to reproduce content data (Data).

Other References

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