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However, the original disc itself does not play correctly in some CD/DVD players. Commercial Audio CD/DVD protection schemes Cactus Data Shield Works by intentionally violating Red Book CD Digital Audio standards, such as erroneous disc navigation and corrupted data, prevents successful ripping of the data. SafeDisc (version 4) See SafeDisc (versions 1-5) in previous section.

A solution for Video-DVDs provided by Protect Software. ProtectDISC Video Prevents ripping software to analyze the structure of the DVD. A solution for software and games on CD or DVD provided by Protect Software. ProtectDISC Software Adds unique digital signature to the CD or DVD that cannot be transferred from copy to copy. LaserLock Includes hidden directory on the CD containing corrupted data which will cause errors while being copied. DVD region code Restricts region where media can be played by matching region number with configuration flag in DVD players. DVD-Cops See CD-Cops in previous section. Burst Cutting Area Writing barcode in circular area near the center of the disc (referred to as burst cutting area) which cannot be written without using special equipment. Sony ARccOS Protection Inserting corrupted sectors in areas where normal players will not access but ripping software does to trigger errors during replication. Commercial DVD protection schemes Analog Protection System Adds pulses to analog video signals to negatively impact the AGC circuit of a recording device so the images on copied DVDs becomes garbled. However, twin sectors may be hard to read in order to copy but are easy to write. TAGES Verifies authentic copy by checking existence of "twin sectors" which are sectors with same logical address but different data. StarForce Asks for Serial ID at install or startup to verify the license. SecuROM Limits the number of PCs activated at the same time from the same key.

Also used to implement trial editions of programs. SafeCast The encryption key will expire after pre-determined date so the media can be used only temporarily.

SafeDisc (versions 1-5) Adds unique digital signature at the time of manufacturing which is designed to be difficult to copy or transfer so that software is able to detect copied media.