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US4558302 Patent - http://www.delphion.com/details?pn=US04558302__
The US patent covering the LZW compression algorithm used in GIF images. |
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Unisys/CompuServe GIF Controversy - http://lpf.ai.mit.edu/Patents/Gif/Gif.html
Old page from the League for Programming Freedom (LPF) on the Unisys patent controversy. |
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The GIF Controversy - http://cloanto.com/users/mcb/19950127giflzw.html
A 2004 article on the GIF controversy seen from a software developer's perspective. Includes original interviews, a historical perspective, and a detailed bibliography. |
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Graphics Interchange Format - http://www.w3.org/Graphics/GIF/spec-gif87.txt
Original specification describing the file layout as originated by CompuServe. Also known as Gif87a. |
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The gif2png Home Page - http://catb.org/~esr/gif2png/
Page prepared in 2003 about a program that converts files from GIF to PNG. The conversion preserves all graphic information, including transparency. |