GIF Patent To Expire, Will PNG Survive?
News LZW forms the basis of the popular GIF (Graphics Interchange Format). LZW patent owner Unisys said it has no plans to apply for an extension to the US patent, or to patents in Canada, Japan, the UK, Germany, France and Italy -- though it will...
[June 9, 2003, 12:24]
W3C Rejigs Image Format
News The patent, for the Lempel-Ziv-Welch, or LZW, a compression algorithm, forms the basis of the popular GIF (Graphics Interchange Format) design. Once LZW patent-owner Unisys announced its intention to seek royalties for the use of GIF graphics in...
[November 12, 2003, 12:20]
Microsoft Adds IP Indemnity To Linux Fight
Talkback Even going back to the LZH/GIF Unisys patents http://web.archive.org/web/20020806173115/http://www.unisys.com/about__unisys/lzw/ Microsoft Corporation obtained a license under the above Unisys LZW patents in September, 1996.
[November 10, 2004, 9:13]
Stallman: Three Ways To Deal With Software Patent Threats
News The same LZW compression algorithm was also used in image formats such as the GIF format. There are in fact two patents covering the LZW compression algorithm. In the second part of Richard Stallman's speech at the Cambridge Computer Lab, the free...
[March 28, 2002, 10:40]
JPEG Committee Refutes Patent Claim
News Unisys attracted criticism when it said that Web sites that provide GIFs for download that were created with an unlicensed copy of the Lempel-Ziv-Wlech (LZW) compression algorithm were guilty of contributory infringement of its patent and could be...
[July 22, 2002, 10:47]
