Patent ID: 7873162

Claim:
A recording method comprising: searching, by a processor, for at least one of a plurality of free areas on a storage medium, said storage medium including a file that is stored according to a file system; generating a track descriptor having a track attribute and an encryption key to encrypt a data to be stored as an encrypted data in said storage medium; generating a part descriptor having a part pointer information that points to said file; recording said data encrypted with said encryption key in said at least one of said plurality of free areas; connecting said at least one of said plurality of free areas where said encrypted data is recorded to an end of said file managed by said file system; recording in said part descriptor the part pointer information that points to said at least one of said plurality of free areas where said encrypted data is recorded; recording in said track descriptor a decryption key so as to enable later decryption of said encrypted data, and pointer information that points to said part descriptor; and recording a track number that points to said track descriptor in a play order table having a play order of a plurality of tracks.