Patent ID: 8443454

Claim:
A method of preventing illegal reuse of Digital Right Management (DRM) content in a portable terminal, the method comprising: performing user authentication when there is an attempt to restore a Right Object (RO) backup file; determining whether information on the RO backup file is pre-registered in the terminal; registering the information on the RO backup file in the terminal, when the information on the RO backup file is not pre-registered in the terminal; determining whether the pre-registered information is identical to the information on the RO backup file, when the information on the RO backup file is pre-registered in the terminal; and determining whether the RO backup file can be restored according to whether the pre-registered information is identical to the information on the RO backup file, wherein determining if the RO backup file can be restored comprises: disabling a restore of the RO backup file, when the pre-registered information is identical to the information on the RO backup file, and enabling a restore of the RO backup file in the terminal, when the pre-registered information is not identical to the information on the RO backup file.