Title: Recording/reproduction device and content protection system
Application Number: 200580010489 Application Date: 2005.02.01
Publication Number: 1938693 Publication Date: 2007.03.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G06F12/14;G06K17/00;G09C1/00
Applicant(s) Name: Matsushita Electric Ind Co., Ltd. Address:
Inventor(s) Name:
Attorney & Agent: hujian xin
Abstract:
    A recording/reproduction device (10) receives a content broadcast from a content supply device (11). The recording/reproduction device (10) encrypts the received content by using a device key and generates a first encrypted content. The recording/reproduction device (10) decrypts the first encrypted content generated, and generates a content. The recording/reproduction device (10) subjects the generated content to an image conversion so as to generate a converted content and encrypts the generated converted content by using a medium key so as to generate a second encrypted content. The recording/reproduction device (10) writes the second encrypted content, the medium key, and the device key into a portable medium (14). When the portable medium (14) is inserted into a mobile information terminal (15), the mobile information terminal (15) decrypts the second encrypted content by the medium key and reproduces it.
Time: 9