lpress@venera.isi.edu (Laurence I. Press) (11/28/89)
Can someone point me to public domain source code for Lempel-Ziv? The target platform is OS/2. Thanks, Lar
tris@alzabo.uucp (Tris Orendorff) (11/30/89)
lpress@venera.isi.edu (Laurence I. Press) writes: >Can someone point me to public domain source code for Lempel-Ziv? >The target platform is OS/2. Look for the source code for Arc V5.1. The code for LZ compression and decompression is in there. This was easy to find about one year ago and should still be available. -- Sincerely Yours Tris Orendorff .......................................................................
brad@looking.on.ca (Brad Templeton) (12/04/89)
There is no such thing as a public domain Lempel Ziv Welch. The algorithm is patented by Unisys. Of course, Unisys doesn't seem to persue uses of it outside the hard disk controller field, but they haven't officially lost the patent yet. There is some common PD source code for LZW on Unix systems, but I haven't the faintest idea of what a PD implementation of a patented algorithm means. -- Brad Templeton, ClariNet Communications Corp. -- Waterloo, Ontario 519/884-7473
bron@bronze.wpd.sgi.com (Bron Campbell Nelson) (12/05/89)
In article <56000@looking.on.ca>, brad@looking.on.ca (Brad Templeton) writes: > There is no such thing as a public domain Lempel Ziv Welch. The algorithm > is patented by Unisys. > Ummm ... it has always been my understanding that an *algorithm* is not patentable. It qualifies essentially as a "law of nature." What *is* patentable is the application of the algorithm to a particular job, or a particular implementation of the algorithm. Thus, I'm quite willing to believe that Unisys holds some sort of patent on using Lempel-Ziv *in a disk controller*, but not a patent on the algorithm itself. Could some lawyer type clarify this? -- Bron Campbell Nelson bron@sgi.com or possibly ..!ames!sgi!bron These statements are my own, not those of Silicon Graphics.
johnk@opel.uu.net (John Kennedy) (12/05/89)
> >Could some lawyer type clarify this? ^^^^^^ ^^^^^^^ Baaaaaaahahahahaha
ben@vmsa.technion.ac.il (Ben Pashkoff) (12/26/89)
In article <45686@sgi.sgi.com>, bron@bronze.wpd.sgi.com (Bron Campbell Nelson) w rites: > In article <56000@looking.on.ca>, brad@looking.on.ca (Brad Templeton) writes: >> There is no such thing as a public domain Lempel Ziv Welch. The algorithm >> is patented by Unisys. >> > -- There is a PD Lempel-Ziv based compression routine in C on almost all the DECUS SIG tapes. ________________________________________________________________________ | | | Ben Pashkoff BEN@VMSA.TECHNION.AC.IL | | BEN@TECHMAX.BITNET | | BEN@TECHUNIX.BITNET | | VAX/VMS Systems | | Computer Center | | Technion IIT Phone:(972)-4-292177 | | Haifa, Israel 32000 FAX: (972)-4-221581 | |______________________________________________________________________|