PNG (Portable Network Graphics) Specification, Version 0.91
Revision date: 8 November, 1995
Copyright 1995, Thomas Boutell.
Permission is granted to reproduce this specification in complete
and unaltered form. Excerpts may be printed with the
following notice: "excerpted from the PNG
(Portable Network Graphics) specification, version 0.91."
No notice is required in software
that follows this specification; notice is only required
when reproducing or excerpting from the specification itself.
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