Patent ID: 7984506

Claim:
A digital rights management system comprising: a content server configured to store contents created by content creators; a mobile device configured to acquire and use a desired content from the content server; and a data preservation server configured to preserve the content used by the mobile device so as to enable the content to be uploaded from the mobile device and downloaded to a respective mobile device; wherein the content server is further configured to create rights information for the content, and to deliver the content and the rights information to the mobile device in response to a request from the mobile device, the rights information containing availability of backup saving of each of the content, the rights information of the content, status information of the rights information, and annex information; and the mobile device is further configured to create backup data of an authorized one of the content, the rights information of the content, the status information of the rights information, and the annex information when using the content based on the availability of backup saving and transmit the backup data to the data preservation server for preservation of the backup data.