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Re: [codec] Authors and disclosures, regarding Last Call: <draft-ietf-codec-opus-12.txt>

Koen Vos <koen.vos@skype.net> Thu, 03 May 2012 22:57 UTC

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From: Koen Vos <koen.vos@skype.net>
To: Jean-Marc Valin <jmvalin@jmvalin.ca>, "Kevin P. Fleming" <kpfleming@digium.com>
Thread-Topic: [codec] Authors and disclosures, regarding Last Call: <draft-ietf-codec-opus-12.txt>
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Date: Thu, 03 May 2012 22:57:19 +0000
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References: <CAOf0ZB_S+rB20NQCBB=tsO=5iti4HhnEZRTte2pJuz2O36uQ-A@mail.gmail.com> <4FA07CE4.7090206@mozilla.com> <4FA12C35.9000703@digium.com>, <4FA1392E.8040702@jmvalin.ca>
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Subject: Re: [codec] Authors and disclosures, regarding Last Call: <draft-ietf-codec-opus-12.txt>
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Jean-Marc wrote:
> Also, fortunately prior art gets established based on the time Silk was available even in obfuscated
form.

The first incarnation of SILK was included in the Skype application in January 2009.  While there are some algorithmic differences with SILK in Opus, most of the methods are the same.  You can download the old SILK from the Skype developer web site, if you wanted to compare the two.

best,
koen.

________________________________________
From: codec-bounces@ietf.org [codec-bounces@ietf.org] on behalf of Jean-Marc Valin [jmvalin@jmvalin.ca]
Sent: Wednesday, May 02, 2012 6:39 AM
To: Kevin P. Fleming
Cc: codec@ietf.org
Subject: Re: [codec] Authors and disclosures, regarding Last Call: <draft-ietf-codec-opus-12.txt>

On 12-05-02 08:44 AM, Kevin P. Fleming wrote:
> While it's true that SILK was available at that time, it was only
> available in binary form embedded inside products delivered by Skype,
> and those products heavily obscure and encrypt their behavior. It seems
> unlikely that anyone who had IPR in any of its methods would have been
> able to determine that SILK was potentially infringing before its source
> code was made available. I would consider the 'first public disclosure'
> date to be the first time the source code was published.

As far as I can tell, the actual source code was released as open source
in March 2010, though it may have been available before that to
developers willing to sign some agreement. Also, fortunately prior art
gets established based on the time Silk was available even in obfuscated
form.

        Jean-Marc
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