[vorbis-dev] patents and separate entropy coding

Monty xiphmont at xiph.org
Fri Dec 15 12:00:49 PST 2000

> Thing is, I understand that they have a patent on compressing audio by
> transforming to the frequency domain, quantising, and then entropy
> encoding, which is what Ogg Vorbis does, so there's trouble. 

No.  The patent (well, patents; there are several that read
approximately like this) is not anywhere as broad as you're saying.
Go read them all; there's a list linked from the LAME pages. Remember
that patent claims are like concentric circles, each further narrowing
the claims made before.  You have to read *all* the claims.

Our IP attourneys say we're totally clear.  Relax.  Vorbis does not
infringe any patent we've looked at.


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