As I understand it, everything is open (not open source, necessarily) from the SVG spec to the RTMP except for some patented codecs (like Sorenson Spark), and companies other than Adobe hold those patents. I'm not an expert, though. Go check out Adobe's Open Screen Project's FAQ.

ActionScript has actually been open source for a while.


Edited by wfaulk (26/02/2010 16:29)
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Bitt Faulk