Introduction
ARccOS (Advanced Regional Copy Control Operating Solution) is a copy-protection system designed by Sony for some DVDs as an additional layer to be used in conjunction with Content Scramble System (CSS).

How Does ARccOS Work?
ARccOS creates corrupted sectors on the DVD on purpose to make copying software to produce errors during copy process.

ARccOS Flaw
Sony promoted ARccOS protected discs as "fully compatible with available DVD players and drives". But the fact is not like this. It happens from time to time that a Sony disc with ARccOS wouldn't play on your DVD player.

Passkey Solution
Passkey can remove ARccOS on DVD so that you can take advantage of some software to copy/rip/clone/backup/burn/convert it, or just enjoy it on your player with 100% smooth playback.