(i9) United States
(12) Patent Application Publication oo) Pub. No.: US 2007/0033143 Al
Saito (43) Pub. Date: Feb. 8,2007
(75) Inventor: Makoto Saito, Tokyo (JP)
BERKELEY LAW & TECHNOLOGY GROUP
1700NW 167TH PLACE
BEAVERTON, OR 97006 (US) (73) Assignee: Intarsia Software LLC
(21) Appl. No.: 11/491,400
(22) Filed: Jul. 20, 2006
Related U.S. Application Data
(60) Continuation of application No. 10/013,507, filed on Dec. 13, 2001, which is a division of application No. 08/868,488, filed on Jun. 3, 1997, now Pat. No. 6,424,715, which is a continuation-in-part of application No. 08/549,270, filed on Oct. 27, 1995, now abandoned, and which is a continuation-in-part of application No. 08/573,958, filed on Dec. 13, 1995, now Pat. No. 5,740,246.
There are provided a digital content management apparatus which further embodies a digital content management apparatus used with a user terminal, and a system which protects the secrets of a digital content. The system and the apparatus are a real time operating system using a micro-kernel, which is incorporated in the digital content management apparatus as an interruption process having high priority. When a user uses the digital content, whether there is an illegitimate usage or not, is watched by interrupting the usage process. In the case where illegitimate usage is carried out, a warning is given or the usage is stopped. The decryption/re-encryption functions of the digital content management apparatus having the decryption/re-encryption functions are not restricted to the inside of the user apparatus. By providing the decryption/re-encryption functions between the networks, the exchange of secret information between different networks is secured. By using this apparatus for converting a crypt algorithm, information exchange is made possible between systems which adopt different algorithms.