http://www.boutell.com/gd/ is the web page of the original author of the
GIF creation library GD.   Originally, when [Compuserve] created GIF, the
file format most commonly used included a compression algorithm that was
patented by UNISYS.  When UNISYS began enforcing their patent, work on
free GIF creation libraries shifted from generating compressed files using
the patented algorithm to creating image files uncompressed.

The UNISYS patent has expired, and libgd is alive and well.

  http://martin.gleeson.com/fly/installation.html

  http://www.rime.com.au/gd/










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