Patent ID: 8151356

Claim:
A method of transmitting first content, which is obtained by processing content using first digital rights management (DRM) system, from a first device that uses the first DRM system to a second device that uses second DRM system, the method comprising: (a) generating, by a DRM conversion server, a ticket using a first license server and a second license server, the first license server issuing a first license for use in the first DRM system and the second license server issuing a second license for use in the second DRM system; (b) the second device obtaining a second content key required to process the content using the ticket and the second DRM system; and (c) the second device receiving the content from the first device and processing the content using the second content key and the second DRM system, wherein the ticket comprises use control information which specifies a restriction of use of the content, and the second content key required to process the content using the second DRM system wherein the second device receives the content from the first device separately from receiving the ticket from the DRM conversion server, and wherein (a) comprises: (a1) receiving the first license from the first device; (a2) receiving the use control information from the first license server, the use control information generated by the first license server and extracted from the first license: (a3) receiving the second content key, which is generated by the second license server, from the second license server; and (a4) generating the ticket using the use control information and the second content key.