Description: It is in-process marked that the threads of information, speeds of its treatment and distribution, grow with development of informative society, and in this connection there is a sharp necessity for defence of interests of subjects, ut illizings information in the activity. The questions of reliable priv are examined with the use of modern tools and methods of стеганографии. Possibility of the use for defence of copyrights is rotined audio and videofiles through introduction in them of the hidden objects – digital thread-marks. It is arrived at by unnoticeable for a human eye or ear of change of file. Digital thread-marks can contain some authentic code, I.e. the coded information about an owner or managing information.
Keywords: multimedia information, defence of copyrights, digital thread-marks