Method and apparatus for automatic labeling of printing a data processing system

The present invention relates to a method and a device for automatic marking of printouts a data processing system to which a user inputs a print of a document in order and at least a part of the document data of the document is provided with a not directly perceptible to the user on the expression of marker. The method and the device are characterized by that generated by a mechanism for executing the print job print data comprise at least the document data and control data are redirected within the data processing system in a non-accessible to the user operating system level a labeling component, the mark the the document data makes. DOLLAR A The procedure enables secure marking of all printed documents by which the client of expression and the authenticity of each document can be easily detected.