Abstract: A digital rights management system (1) includes a content server (30) that stores contents created by content creators, a mobile device (21, 22) that acquires and uses a desired content from the content server, and a data preservation server (40) that preserves the content used by the mobile device so as to enable the content to be uploaded and downloaded. The content server is configured to create rights information for the content, the rights information containing availability of backup saving of the content in the data preservation server, and to deliver the content and the rights information to the mobile device in response to a request from the mobile device. The mobile device is configured to create backup data 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.

Abstract: A data backup system includes a mobile device, a data storing apparatus for backup-saving user data used in the mobile device, and a user management apparatus for managing user information about a user using the mobile device, where the device and apparatuses communicate with each other. When the mobile device is a replacement for an old mobile device, the user management apparatus stores and manages a device ID of the mobile device in association with an old device ID of the old mobile device and personal identification information of a user using the mobile device and who has used the old mobile device. When downloading old user data previously used in the old mobile device from the data storing apparatus, the mobile device creates and transmits a user data acquiring request message with an old device user data acquiring request flag activated to the data storing apparatus.

Abstract: A digital rights management system (1) includes a content server (30) that stores contents created by content creators, a mobile device (21, 22) that acquires and uses a desired content from the content server, and a data preservation server (40) that preserves the content used by the mobile device so as to enable the content to be uploaded and downloaded. The content server is configured to create rights information for the content, the rights information containing availability of backup saving of the content in the data preservation server, and to deliver the content and the rights information to the mobile device in response to a request from the mobile device. The mobile device is configured to create backup data 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.

Abstract: A data backup system includes a mobile device, a data storing apparatus for backup-saving user data used in the mobile device, and a user management apparatus for managing user information about a user using the mobile device, where the device and apparatuses communicate with each other. When the mobile device is a replacement for an old mobile device, the user management apparatus stores and manages a device ID of the mobile device in association with an old device ID of the old mobile device and personal identification information of a user using the mobile device and who has used the old mobile device. When downloading old user data previously used in the old mobile device from the data storing apparatus, the mobile device creates and transmits a user data acquiring request message with an old device user data acquiring request flag activated to the data storing apparatus.