CD-Lock

Almost universally used by games released by Eidos interactive.

Unless mixed mode discs with this DRM will always have 4 tracks (example). Two Audio with two Data surrounding them and if the later Data Track is missing, DRM will either be remnant or a false positive from BoS.

Note that [/Bitpool Bitpool] protected discs often have an identical configuration. What sets CD-Lock apart though is the lack of any EDC errors as the DRM is based around a fake TOC instead.