Gif Unisys and LZW patent enforcement
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animated GIFs to loop. While GIF was developed by CompuServe, it used the Lempel–Ziv–Welch (LZW) lossless data compression algorithm patented by Unisys in 1985...- Lempel–Ziv–Welch (redirect from LZW compression algorithm)on 2012-04-12. Retrieved 2009-03-03. U.S. patent 4,558,302 "LZW Patent Information". About Unisys. Unisys. Archived from the original on June 26, 2009...
League for Programming Freedom (redirect from Burn All GIFs)the League started the "Burn all GIFs" campaign in opposition to the actions of Unisys in enforcing their patent on LZW compression used by CompuServe when...- (Main article: GIF) EP 0129439 Unisys's patent on LZW compression, a fundamental part of the widely used GIF graphics format. US 4698672 and its EP equivalent...
- Unisys claimed to have granted royalty free licenses to hundreds of not-for-profit organizations that used the patented LZW compression method and, by...
Asure Software (category Patent monetization companies of the United States)the patent. They also noted the similarity to Unisys' attempts to assert rights over the GIF image compression standard via LZW patent enforcement. The...- Compress (software) (category Unix archivers and compression-related utilities)All patents on the LZW worldwide have also expired (see Graphics Interchange Format#Unisys and LZW patent enforcement). In the up-coming POSIX and Single...
- an alternative to GIF when Unisys decided to enforce its software patent on LZW data compression that was used in the then popular GIF format. The PNG format