On Wed, Apr 09, 2014 at 10:19:59AM +0800, Steve Underwood wrote:
> Hi Jeff,
>
> On 04/08/2014 12:13 PM, Jeff Brower wrote:
> >Darrel- The G729 essential patents were *granted* in 1996, but
> >applied for prior to June 8 1995. That means their lifespan is
> >either 20 years from their application date, or 17 years from
> >their grant date, whichever is greater
> >(http://www.uspto.gov/main/faq/p120013.htm). Either way, they
> >expire in 2014. -Jeff
> Where did you get the cutoff date of June 8 1995, and how does 20
> years from that date lead to the last of the patents expiring in
> 2014? Nobody uses G.729. They use G.729A. The G.729A spec is
> somewhat later than the original G.729, but I don't know if there
> are any additional patents which specifically relate to Annex A. You
> could use G.729 instead, but it roughly doubles the compute needed.
If it allows me to avoid the trolls: I'll pay that performance hit. In
many caces there are CPU cycles to spare. But the licensing is a hard
limit.
>
> There are various things on the web saying the last of the patents
> on G.723.1, which was around in draft form long before G.729,
> expires in 2014. However, there seem to be patents related to that
> codec which don't really expire until some time in 2015. Its really
> hard to find solid information. The ITU patent database rarely
> identifies the actual patents being claimed, so its damned hard to
> look them up.
Nice.
--
Tzafrir Cohen
icq#16849755 jabber:[email protected]
+972-50-7952406 mailto:[email protected]
http://www.xorcom.com
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