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List: kde-licensing
Subject: Possible S3TC patent issue in kdelibs
From: Michael Pyne <mpyne () kde ! org>
Date: 2013-05-14 0:59:15
Message-ID: 2615850.Mmb3OclI9d () midna
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Hi all,
I was working on some QA notice bugfixes in kdelibs that have been reported
for a long time (bug 259826), and came across the DDS image decoder (in
kdelibs/kimgio/dds.cpp).
The code claims to decompress Microsoft DirectDraw Surface files compressed
with various S3TC-family encoding algorithms, including DXT{1,2,3,4,5}. As far
as I've been able to test, the code does accurately implement this.
However as far as I know S3TC is potentially patented. E.g. the Mesa project
ships any code that can encode or decode S3TC-family algorithms in a separate
library [1], which can only be linked in at runtime.
I won't tell you all what to do (I'm certainly no fan of software patents,
especially for something as trivial as this code), but I did want to bring up
the potential issue.
[1] http://dri.freedesktop.org/wiki/S3TC/
Regards,
- Michael Pyne
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