Steganography music.

Steganography is a very old method (it goes back to the Greeks and Persians) to hide information in a image that the eye without noticing, as originally the tattoos done on the heads of slaves (invisible until after a shave) and the engravings on the bases of wax tablets, discovered only after it has dissolved all. The same method (slight variations, virtually undetectable) can also be applied to music files. Through the famous LSB (least significant bits), compression implemented in the standard mp3 can hold, rather than discard, some bytes of sound that does not affect on listening to the song and redirect it to the storage of information such as the owners of the song, and the authors a serial number. Which explains why the Fraunhofer group you are proposing left and right as final solver of the problems of copyright.