The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 2005
Filed:
Jul. 12, 2002
Ryuji Ishiguro, Tokyo, JP;
Yoshitomo Osawa, Kanagawa, JP;
Yoshio Osakabe, Kanagawa, JP;
Makoto Sato, Tokyo, JP;
Hisato Shima, Saratoga, CA (US);
Tomoyuki Asano, Kanagawa, JP;
Takehiko Nakano, Kanagawa, JP;
Ryuji Ishiguro, Tokyo, JP;
Yoshitomo Osawa, Kanagawa, JP;
Yoshio Osakabe, Kanagawa, JP;
Makoto Sato, Tokyo, JP;
Hisato Shima, Saratoga, CA (US);
Tomoyuki Asano, Kanagawa, JP;
Takehiko Nakano, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An information processing apparatus and an information processing method are capable of preventing information from being copied illegally. To put it in detail, a hash function and a service key are stored in advance in an EEPROM of a DVD player serving as a source. In an EEPROM of a personal computer (PC) serving as a sink, on the other hand, its ID and a license key are stored beforehand. The DVD player requests the PC to transmit the ID. The DVD player then applies the hash function to data resulting from concatenation of the ID with the service key to generate a license key (=hash (ID∥service_key)). Subsequently, the DVD player generates a source side common session key and encrypts the session key by using the generated license key. Then, the DVD player transmits the encrypted source side common session key to the PC. The PC decrypts the encrypted source side common session key by using the license key stored in its EEPROM to produce a sink side common session key which has a value equal to that of the source side common session key.