Patent ID: 7979708

Claim:
A method for digital rights management in a mobile terminal, the method comprising: requesting, by the mobile terminal, a download of digital contents from a contents server; downloading the requested digital contents; generating, by the mobile terminal, an encryption key in response to an encryption key generation command using an identification of the mobile terminal and an encryption initialization code; encoding, by the mobile terminal, the downloaded digital contents using the generated encryption key; storing the encoded digital contents in the mobile terminal; determining, by the mobile terminal, that the stored encoded digital contents can be replayed; decoding, by the mobile terminal, the stored digital contents using the generated encryption key; performing, by the mobile terminal, a user-terminal authentication to connect to a billing server; and transmitting, from the mobile terminal to the billing server, information relating to use of the decoded digital contents used to perform a billing operation, wherein the transmitted information comprises a weight value assigned to each of the decoded digital contents.