Patent ID: 7690042

Claim:
Method for sharing content protected by digital rights management (DRM) between a first mobile electronic terminal device and a second mobile electronic terminal device, wherein said first mobile electronic terminal device is authorized for accessing said content, comprising: receiving a request for sharing said content from said second mobile electronic terminal device; answering said request by sending a confirmation to said second mobile electronic terminal device about authorization of said first mobile electronic terminal device to access said content; a data signal based on said authorization to said second mobile electronic terminal device and indicative of at least one condition said second mobile electronic terminal device has to meet in order to be authorized for accessing said content; wherein a key for accessing said content is provided in said first mobile electronic terminal device, further comprising: receiving a clock synchronization signal from said second mobile electronic terminal device; generating a plurality of keys k i derived from said key, wherein said keys k i are suitable to partially access said content; and sending said keys k i to said second mobile electronic terminal device in accordance with said clock synchronization signal.