[cc-community] detecting cc license on PNG

Jon Phillips jon at creativecommons.org
Sat Mar 8 21:29:27 EST 2008


On Sat, 2008-03-08 at 17:32 -0800, Mike Linksvayer wrote:
> On Sat, Mar 8, 2008 at 5:13 PM, Lucas Gonze <lucas.gonze at gmail.com> wrote:
> > Is there an existing method for PNG creators to mark their images such
> >  that a simple program can detect the CC license?
> 
> http://wiki.creativecommons.org/XMP
> http://en.wikipedia.org/wiki/Extensible_Metadata_Platform#Location_in_File_Types
> 
> >  I can imagine a method to do it -- a bit-for-bit comparison of a
> >  designated portion of the image -- but I'd rather not start from
> >  scratch.
> 
> You mean encoded in the image data? Not that I know of. It would be
> easy to do (assuming it doesn't need to be robust, in which case you
> probably run into a watermarking patent minefield), but nearly
> impossible to get any other software to care.
> 
> Mike
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> cc-community mailing list
> cc-community at lists.ibiblio.org
> http://lists.ibiblio.org/mailman/listinfo/cc-community

Actually, you should be able to use liblicense to read/write XMP in png
file with liblicense:

http://creativecommons.org/projects/liblicense

Here is a lovely chart detailing how to support cc license embedding in
different file types that Jason Kivlighn made last summer:

http://wiki.creativecommons.org/Tracker_CC_Indexing

Also, in reading this, I somewhat misplaced the need/hope to get more
filetype support in new/different formats...

Jon

-- 
Jon Phillips
jon at creativecommons.org
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Business + Community Manager
Creative Commons
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