| 摘要 |
PROBLEM TO BE SOLVED: To provide information effective for tracking an unauthorized copy or the like without affecting the execution of contents by imprinting ID information related to the information terminal or the user to a prescribed position in the data string of the contents in the information terminal at the time of utilizing the contents in the information terminal. SOLUTION: A contents manager authenticates the user and then, sends a viewer 12 through a network to the PC 4 of the user. The viewer 12 is provided with an image decoding part 14 for decoding images or the like, an ID holding part 16 for storing an ID and an ID imprinting part 18 for imprinting it to the decoded images. The contents are ciphered and decoding algorithm is stored in the image decoding part 14. The ID intrinsic to the user is provided by the contents manager at the time of providing the viewer. When the imprinting of the ID is completed, the images including the ID are sent to a display control part 20 and provided for use. |
