Patent ID: 8176322

Claim:
A method of moving a rights object from a device to a portable storage device, the method comprising: decrypting the rights object using a unique key of the device before converting the rights object; converting a format of the rights object supported by the device into a format of the rights object supported by the portable storage device using the device to generate a converted rights object; allocating a sequence number to the rights object; encrypting the converted rights object using the device to generate an encrypted rights object after the allocating sequence number; transmitting the encrypted rights object from the device to the portable storage device; and deactivating the rights object stored in the device and maintaining the rights object stored in the device to be able to be reactivated again if the transmitting the encrypted rights object is completed, wherein the format of the rights object supported by the portable storage device is a binary stream format, the format of the rights object supported by the device is a text format, the rights object has a limited license to access digital contents, and the rights object is dividable into two or more portions for the format conversion when the rights object is being converted.