ARccOS (Advanced Regional Copy Control Operating Solution) is a copy-protection system made by Sony that is used on some DVDs. Designed as an additional layer to be used in conjunction with Content Scramble System (CSS), the system deliberately creates corrupted sectors on the DVD to mess with DVD copying.

Unfortunately, some DVDs with ARccOS such as Disney's "Pirates of the Caribbean: Dead Man's Chest," The Weinstein Company's "Lucky Number Slevin," and Sony's "Casino Royale," "The Holiday," and "Stranger Than Fiction" cannot be played on some DVD players: Sony DVPCX995, Toshiba SD4700, Harman Kardon DVD101, Microsoft Xbox and others. Sony has announced a future firmware update for their players to fix this incompatibility issue. One revision of the ARccOS scheme used by Sony was incompatible with a higher number of players than average. Sony has offered to replace those discs for owners having problems; the replacement discs will have a newer version of ARccOS coding on them, which Sony claims is more compatible.

RipGuard was design by Rovi In February 2005, to prevent or reduce digital DVD copying by altering the format of the DVD content to disrupt the ripping software. Rovi claimed that "only 5 percent of users have the knowledge and determination required to break through the RipGuard DVD copy protection and decrypt the underlying CSS." It's compatible with today's DVD players and PCs.