An information recording apparatus has a content encryption section which encrypts content information with an encryption key and outputs encrypted content information, a control section which identifies an already moved area in the content information and generates a reproduction enable condition containing reproducible area information indicating a movable area, a hash arithmetic device which executes hash calculation for the reproduction enable condition and stores an arithmetic result in a register, and a hard disk drive which records the encrypted content information output from the encryption section and the reproduction enable condition. Even content information that remains after interruption during movement can be moved.