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Microsoft believes it may have come up with a solution. The new software is called the Windows Media Data Session Toolkit. It enables music labels to lay songs onto a copy-controlled CD in multiple layers, one that would permit normal playback on a stereo and a PC. The PC layer, laid digitally on the same disc, can be modified by the content provider, so that they could prevent, for example, burning songs onto another CD, said David Fester, general manager, digital media entertainment for Microsoft.