History of MPEG-1

	Revision 6 . . November 10, 2001 4:31 pm by Damian Yerrick [The link calls them "parts" not "layers." Layers refers to audio codecs of increasing complexity and increasing legal encumbrance.]
	Revision 5 . . (edit) October 21, 2001 5:49 pm by Hannes Hirzel

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