Patent ID: 7640596

Claim:
A method for preventing an illegal distribution of digital content data at a mobile device including at least first and second program code segments, the method comprising: receiving the digital content data from a first device, the digital content data including a copyright code segment for managing copyright infringement, the digital content data in the first device being provided by a digital data server through a communication network; checking the copyright code segment by using the first program code segment, the copyright code segment indicating whether or not the digital content data is permitted to be outputted to a second device in order to reproduce the digital content data at the second device; performing an output operation of the digital content data to the second device by using the second program code segment based on the checked copyright code segment, the outputted digital content data being reproducible at the second device, wherein a decrypting operation and a reproducing operation of the digital content data are executed by a software program provided by said digital data server, and wherein the copyright code segment corresponds to at least one of a copy restriction, a limited copy restriction, and a copy permission; and updating the copyright code segment according to the output operation.