Liquid Audio watermarking.

. EMusic

7.2.01 Liquid Audio watermarking.
Liquid Audio announced the registration of yet another patent obtained by the U.S. Patent Office for the watermarking of digital audio tracks. The new technique involves some mechanism to 'inoculate' and extract 'watermark' that is the kind of watermarks of data, which require many calculations in less than many techniques so far exhausted.