A digital data recording apparatus for recording digital data on a recording medium, comprising: communication means for receiving encrypted digital data via a digital network,; decryption means for decrypting the encrypted digital data that has been received by the communication means; encryption means including a plurality of encryption units (111, 112, 113) that re-encrypt digital data that has been decrypted by the decryption means in encryption systems having different security levels; recording means for recording digital data that has been re-encrypted by the encryption means on the recording medium; designation reception means for receiving, from a user, an instruction regarding designation of one of the plurality of encryption units, the designated encryption unit being for re-encrypting the digital data that has been decrypted by the decryption means; inherent identification information obtaining means for judging whether or not the recordable medium is removable by judging an attribute of the recording medium and for obtaining inherent identification information of the recording medium when judging that the recording medium is removable; and; a controller for controlling the decryption means, the encryption means and the designation reception means, characterized in that when the designation reception means receives the instruction, the controller has the designated encryption unit re-encrypt the digital data that has been decrypted by the decryption means; and when the designation reception means does not receive the instruction, the controller selects one of the plurality of encryption units according to the inherent identification information obtained by the inherent identification information obtaining means, and has the selected encryption unit re-encrypt the digital data that has been decrypted by the decryption means. communication means for receiving encrypted digital data via a digital network,; decryption means for decrypting the encrypted digital data that has been received by the communication means; encryption means including a plurality of encryption units (111, 112, 113) that re-encrypt digital data that has been decrypted by the decryption means in encryption systems having different security levels; recording means for recording digital data that has been re-encrypted by the encryption means on the recording medium; designation reception means for receiving, from a user, an instruction regarding designation of one of the plurality of encryption units, the designated encryption unit being for re-encrypting the digital data that has been decrypted by the decryption means; inherent identification information obtaining means for judging whether or not the recordable medium is removable by judging an attribute of the recording medium and for obtaining inherent identification information of the recording medium when judging that the recording medium is removable; and; a controller for controlling the decryption means, the encryption means and the designation reception means, characterized in that when the designation reception means receives the instruction, the controller has the designated encryption unit re-encrypt the digital data that has been decrypted by the decryption means; and when the designation reception means does not receive the instruction, the controller selects one of the plurality of encryption units according to the inherent identification information obtained by the inherent identification information obtaining means, and has the selected encryption unit re-encrypt the digital data that has been decrypted by the decryption means.