Other Uses
As of December 2005, VEIL was proposed as a DRM tool to counter the analog hole, as a technological measure legally enforced by Digital Content Security Act. In this regard, it is a more fine-grained successor of Macrovision.
VEIL acts together with CGMS-A signal ("broadcast flag") in the vertical blanking interval, where it is used to encode the Rights Assertion Mark (RAM) signal. The CGMS-A can be stripped too easily from the analog signal, therefore the presence of RAM but absence of CGMS-A will tell the copy protection system to deny the copy.
Read more about this topic: Video Encoded Invisible Light