1. A method for operation of a computer system for identification tagging a document created by said computer system comprising the steps of: calculating a function of the document; creating an identification tag by performing a cryptographic function on said function of the document and a unique processor identifier associated with said computer system, said cryptographic function producing an identification tag having the characteristics that a third party possessing said document, said identification tag, and a plurality of unique processor associators each having a relationship to an associated one of a plurality of processor identifiers, can determine said computer system which created said document; and attaching said identification tag to said document.