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and method", it is more commonly known as the LZW patent or Unisys's GIF tax. Don't buy ram at Apple. You can save big money when you buy your memory at MacMemoryStore. Most popular compression techniques build on this technique and most archivers (e. ZIP, ZOO, ARC, gzip, LhA, CAB, Arj, RAR, StuffIt) include it in their compression methods. I only mention this to tell you it's unrelated to LZ78 or LZW. [US4,464,650]>), but the LZW derivative is widely used. Terry Welch has been working for the Sperry Research Center and invents a derivative of LZ78 with much simplified, faster dictionary
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handling. He calls it LZW, after the names of the inventors, Lempel-Ziv-Welch. The article includes a justification for data compression, an overview of common methods, and a detailed explanation and runthrough of the LZW algorithm. is released by Spencer Thomas, after the LZW article was published but before LZW was patented. readers, Spencer decided to implement the LZW algorithm he read in the magazine, completely unaware that there was a patent pending on the technique. 10th December 1985>: LZW patent is granted. September 1986>: The Sperry Corporation (owners of the Sperry Research
AM EST (>4. 06/20/2003 11:49:03 AM EST (>5. 06/20/2003 12:00:05 PM EST (>5. Yet, on the 10th page (journal page 17) of Welch's paper, one can read : "The hardware and software implementations of LZW are Sperry proprietary". IANAL, so maybe there's a subtle distinction between proprietary and patented. I see Rusty's creation of Scoop as being as world changing an event as the fall of the Berlin wall. 06/19/2003 06:05:50 PM EST (>4. 06/19/2003 03:05:01 PM EST (>3. There's only one possible response. Ding Dong! The Witch is dead. Ding Dong! The Wicked Witch is dead. Wake up - sleepy head,
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for Unisys to try to extend the patent. I mean hell, if the copyright to Mickey Mouse can be extended then there's no way they'd let a patent quietly die. 06/19/2003 05:22:31 PM EST (>3. 06/19/2003 07:06:21 PM EST (>1. 06/19/2003 10:03:41 PM EST (>4. This one's for you, ICI. Your vote (1) was recorded. This story currently has a total score of 95. Your vote put this story over the threshold, and it should now appear on the front page. 06/19/2003 11:34:37 AM EST (>5. 06/20/2003 02:36:58 AM EST (>4. 06/20/2003 10:43:11 AM EST (>5. 06/20/2003 10:48:41 AM EST (>3. 06/20/2003 11:08:35
in the slightest. What happened to the "BURN ALL GIFS" rallying cry? It has been forgotten. There are all sorts of excuses; "It's too much hassle to convert all my graphics and their links", "Internet Explorer doesn't support PNG properly", "PNGs can't do animation and nobody supports MNGs". The best one of all: "Unisys will never sue me!". I wish Unisys a happy year squeezing the very last drops out of their monopoly. or "Why He Stopped Writing Compression Software". You must accept a cookie to log in. I don't have a website. I have some, but I'm changing them all to PNGs. Unisys will
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