Copy protection system for portable storage media
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 27, 2005
Grant Date -
N/A
app pub date -
Apr 30, 1999
filing date -
Sep 24, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Systems connected to users generate a plurality of keys which are mutually shared, and download and upload digital contents by using secret channels formed between the systems. An information provider receives an authorization from a certificate authority. A licensed SDMI compliant module (LCM) is authenticated through the information provider, and the information provider and the LCM form a channel. A portable device is authenticated from the information provider through the LCM, and the LCM and the portable device form a channel. The digital content between the LCM and the portable device is downloaded and uploaded according to respective control state data of the LCM and the portable device. The system can use a physical address of a bad sector formed in the portable medium during the manufacturing process for preventing an illegal copy of the downloaded digital contents through the portable device after the digital contents have been downloaded.
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