Provided is a method of transmitting content processed according to first digital rights management (DRM) to a device that uses second DRM. The method includes generating a ticket using a first license server and a second license server, the first license server issuing a first license for use in the...http://www.google.de/patents/US20060026691?utm_source=gb-gplus-sharePatent US20060026691 - Method of transmitting and reproducing content processed by various DRM systems
