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The Unisys patent covers the LZW technology, which is used to create gif, tiff-lzw, pdf-lzw and other image formats. To our knowledge, only gd library version 1.3 and 1.4 are free of LZW code and should therefore be used with gnuplot (unless you have a license, in which case version 1.2 and 1.5 is fine, too). The binaries provided by the gnuplot team have been built with version 1.3. Version 1.6+ cannot be used because support for GIF has been removed altogether, see http://www.boutell.com/gd/.
As all gif-creating versions of gd library seem to have been taken off www.boutell.com, we are providing gd library versions 1.3 and 1.4 at the gnuplot distribution sites (see above). Should any legal problems arise, we will remove this software.
We strongly recommend to use png images instead of gif. The required libraries can be downloaded from http://www.libpng.org/pub/png/pngcode.html and http://www.info-zip.org/pub/infozip/zlib/. They are also available from the gnuplot distribution sites.
The gnuplot team would like to thank all who have contributed discussion, suggestions, bug reports, and patches to improve gnuplot. Special thanks go to Alex Woo for setting up and maintaining the gnuplot web sites. To Dick Crawford for his untiring and competent presence on comp.graphics.apps.gnuplot. To Juergen von Hagen for adopting the orphaned FAQ list. To John Turner for buying gnuplot.org and letting us use it. To Hans-Bernhard Broeker for neverending supply of bug fixes. And, last but not least, to Thomas Williams and Colin Kelley for creating this great software in the first place.