Method, system, mobile device, apparatus and computer program product for validating rights objects

A method of determining whether one or more rights objects associated with a mobile device are valid, said method comprising:

• retrieving a DVB-H (Digital Video Broadcast-Handheld) network time;
• updating a secure clock maintained on the mobile device based at least in part on the DVB-H network time and a user-set clock, wherein the secure clock is not user-changeable, updating the secure clock comprising:
• determining a difference between the DVB-H network time and the user-set clock,
• storing the difference, and
• calculating the secure clock based at least on the stored difference,
• re-retrieving the DVB-H network time every predetermined interval of time,
• at each interval, re-calculating a new difference between the DVB-H network time and the user-set clock,
• replacing the stored difference with the new difference when the new difference differs from the stored difference, and
• re-calculating the secure clock based on the new stored difference;
• and
• using the secure clock to determine whether one or more rights objects associated with the mobile device are valid.