Patent ID: 7921464

Claim:
A method of downloading content in user equipment, comprising: receiving desired content and a right to use content associated with the desired content from a first server, wherein the first server receives the right to use content from a content-using right providing server for providing the user equipment with the right to use content, the right to use content is also provided from the content-using right providing server to a second server, and the second server stores the right to use content; transmitting a request to receive the desired content to the second server, after receiving the desired content from the first server; receiving the requested desired content from the second server, if the right to use content received from the first server is same with the right to use content stored in the second server; receiving an encrypted execution key for executing the requested desired content from the second server, if the right to use content received from the first server is same with the right to use content stored in the second server and the requested desired content has been downloaded by the user equipment; and decrypting the encrypted execution key using a secret key included in the right to use content.