Patent ID: 7747871

Claim:
A computer-implemented information recording method of encrypting contents information and storing the contents information on a storage medium, comprising: encrypting contents information to generate encrypted contents information; merging (a) a first key which allows the encrypted contents information to be decoded and (b) license condition information used for determining whether the first key for decoding the contents is to be output from a decoder on a decoding side or is not to be output from the decoder on the decoding side, to produce a merged result; encrypting the merged result by scrambling information bits in the merged result using a second key to generate a merged and encrypted result including the first key and the license condition information that are inseparably combined by the merging and the scrambling, the first key only being output from the decoder on the decoding side if it is decided by the license condition information that the first key is to be output from the decoder on the decoding side; and storing the encrypted contents information together with the merged and encrypted result on the storage medium.