e/Traitor tracing

Information
has gloss	eng: Traitor tracing is a copyright infringement detection system which works by tracing the source of leaked files rather than by direct copy protection. The method is that the distributor adds a unique value to each copy given out. When a copy of it is leaked to the public, the distributor can check the value on it and trace it back to the "leaker".
lexicalization	eng: Traitor tracing
instance of	c/Applications of cryptography