| US 7,617,536 B2 | ||
| Unauthorized device detection device, unauthorized device detection system, unauthorized device detection method, program, recording medium, and device information update method | ||
| Masao Nonaka, Osaka (Japan); Toshihisa Nakano, Osaka (Japan); Yuichi Futa, Osaka (Japan); Motoji Ohmori, Osaka (Japan); Takeshi Gomi, Tokyo (Japan); Kazukuni Kobara, Tokyo (Japan); and Hideki Imai, Kanagawa (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan); and The University of Tokyo, Tokyo (Japan) | ||
| Appl. No. 10/589,288 PCT Filed Dec. 12, 2005, PCT No. PCT/JP2005/022788 § 371(c)(1), (2), (4) Date Mar. 28, 2007, PCT Pub. No. WO2006/064768, PCT Pub. Date Jun. 22, 2006. |
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| Claims priority of application No. 2004-360436 (JP), filed on Dec. 13, 2004; and application No. 2004-360437 (JP), filed on Dec. 13, 2004. | ||
| Prior Publication US 2007/0283162 A1, Dec. 06, 2007 | ||
| Int. Cl. G06F 17/30 (2006.01) | ||
| U.S. Cl. 726—26 [705/55] | 11 Claims |
| 1. An unauthorized apparatus detection device connected to an information server capable of having a portable media inserted
therein, the portable media further for being inserted into a detection target apparatus, the portable media storing a target
apparatus identifier and a corresponding first verification value, and the target apparatus identifier identifying the detection
target apparatus, the unauthorized apparatus detection device comprising:
a storage unit that stores the target apparatus identifier and the first verification value, the target apparatus identifier
and the first verification value being previously received from the information server by the unauthorized apparatus detection
device;
a generation unit that generates a second verification value that differs from the first verification value that corresponds
to the target apparatus identifier, and that overwrites, in the storage unit, the second verification value in place of the
first verification value;
a transmission/reception unit that transmits to the information server the second verification value, such that the information
server writes the second verification value into the portable media when the portable media is inserted into the information
server, and such that the detection target apparatus overwrites, in the portable media, the second verification value in place
of the first verification value when the portable media is inserted into the detection target apparatus, the transmission/reception
unit receiving, from the information server, the target apparatus identifier and the second verification value, as a received
verification value, when the portable media, into which the second verification value is overwritten in place of the first
verification value by the detection target apparatus, is inserted into the information server;
a control unit (i) that, when the received target apparatus identifier matches the stored target apparatus identifier, judges
whether or not the received verification value matches the stored second verification value, and (ii) that, when it is judged
that the received verification value does not match the stored second verification value, registers the target apparatus identifier
on an unauthorized apparatus list; and
a title key storage unit that stores a title key for decrypting encrypted content,
wherein, when the control unit judges that the received verification value matches the stored second verification value, the
control unit transmits the title key to the information server, such that the information server writes the title key into
the portable media, and such that the detection target apparatus decrypts the encrypted content using the title key when the
portable media storing the title key is inserted into the detection target apparatus.
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