The CAF format is not patented, but there are patented file formats like GIF, ASF or PDF.
Richard Dobson <richarddob...@blueyonder.co.uk> a écrit: > On 04/04/2012 00:13, Sampo Syreeni wrote: > > On 2012-04-03, Richard Dobson wrote: > > > >> Well, we don't need to get hyper-paranoid about it. Apple have > >> defined channel IDs for WXYZ, which goes no further than make it > >> possible to create a 1st-order CAF file. > > > > Agreed. And whatever ambisonic related patents there are for first > > order, they will have run out by now. > > > >> CAF is not closed, the spec is fully open and documented. > > > > On the other hand, Apple hasn't placed any of its coding related > > software patents into the open domain, here, and CAF is rather new. > > Most of the technology could be challenged because it's a > > derivative of EA IFF and then Microsoft RIFF (WAV) derived (even > > EBU's 64-bit WAV derivative is part of the open, prior art). > > > > > ?? what patents? You are tilting at windmills. CAF is a file format > (more precisely a container format), a standard to be followed, not a > device (much less an algorithm) that can be patented. Did you think > WAVE was somehow patented? Or XML for that matter? OK, if you put > something such as an mp3 stream inside a file, then technically you > need a licence to encode/decode it; but there can be no patent > attached to a file format per se. > > See here for all you need to know about CAF (including how to > implement it on other platforms). And note it is extensible in just > the same way WAVEX is: > > https://developer.apple.com/library/mac/#documentation/MusicAudio/Reference/CAFSpec/CAF_intro/CAF_intro.html > > You can download it as a pdf. You will find no reference to a patent > anywhere. > > Richard Dobson > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > -- "Tous les hommes prennent les limites de leur champ visuel pour les limites du monde." Arthur Schopenhauer _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
