ARccOS (Advanced Regional Copy Control Operating Solution) is a copy-protection system made by Sony that is used on some DVDs.
The corrupted sectors are in areas of the disk that most DVD players do not access, but most copying software does.
[2] Sony has announced a future firmware update for their players to fix this incompatibility issue.
[3][4] One revision of the ARccOS scheme used by Sony was incompatible with a higher number of players than average.
[5][6] Some DVD rental companies have warned users that the Sony DVDs in question may not play on their machines.