1. A system for forming a Γ code comprising: means for defining a plurality of fingerprinting words, each fingerprinting word being unique and containing at least one spread sequence, wherein each fingerprinting word contains a plurality of Γ-symbols, each Γ-symbol containing 2c-1 spread sequences, where c is the number of colluders that are desired to be defended against, said fingerprinting words being structured to permit a collusion analysis to ascertain identities of potential colluders who change an associated fingerprinting word; and means for assigning individual fingerprinting words to individual respective entities who constitute potential colluders, the fingerprinting words serving to identify an entity to which it is assigned.