| US 7,539,306 B2 | ||
| Key delivery apparatus, terminal apparatus, recording medium, and key delivery system | ||
| Yuusaku Ohta, Neyagawa (Japan); Hiroki Yamauchi, Ibaraki (Japan); Masaya Miyazaki, Ikeda (Japan); Natsume Matsuzaki, Mino (Japan); and Toshihisa Abe, Izumisano (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Aug. 28, 2003, as Appl. No. 10/649,623. | ||
| Claims priority of application No. 2002-249242 (JP), filed on Aug. 28, 2002. | ||
| Prior Publication US 2004/0078066 A1, Apr. 22, 2004 | ||
| Int. Cl. H04N 7/167 (2006.01) | ||
| U.S. Cl. 380—201 [380/277; 380/231; 380/232; 713/171; 705/51; 707/10] | 14 Claims |
| 13. A key supply method of using a key delivery apparatus that manages a decryption key for decrypting an encrypted content
and manages a suppliable number, which is a number indicating a number of times the decryption key can be supplied to a terminal
apparatus connected to the key delivery apparatus via a network, the key supply method comprising:
receiving, from the terminal apparatus, a supply request, which is a request for the decryption key, the supply request including
one of first information and second information, the first information indicating that the encrypted content is stored in
the terminal apparatus, and the second information indicating that the encrypted content is stored on a portable recording
medium inserted into the terminal apparatus;
determining, based on the received supply request, whether the terminal apparatus records the encrypted content on the portable
recording medium;
determining whether the terminal apparatus is a terminal apparatus of a first-type that manages a content-usage period and
whether the terminal apparatus is a terminal apparatus of a second-type that does not manage the content-usage period; and
supplying, to the terminal apparatus, when the suppliable number indicates that the decryption key can be supplied, (i) the
decryption key and a key-usage period which imposes a restriction on usage of content and is related to the decryption key,
when the determining determines that the terminal apparatus is of the first-type, and (ii) the decryption key, without the
key-usage period such that a restriction on usage of content is not imposed on the terminal apparatus, when the determining
determines that the terminal apparatus is of the second-type, wherein
the determining of whether the terminal apparatus is a terminal apparatus of the first-type determines that the terminal apparatus
is of the first-type when it is determined that the terminal apparatus records the encrypted content on the portable recording
medium.
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