A better word than libre would be unencumbered. There are libre codecs for all of these formats, but the formats are encumbered.

Anyway, according to this page: http://www.osnews.com/story/24954/US_Patent_Expiration_for_MP3_MPEG-2_H_264/ the last patent for MPEG-2 expires in 2018. So 3 more years.

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