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1. #Pkware competitors archive#
2. #Pkware competitors code#
3. #Pkware competitors zip#
4. #Pkware competitors free#

#Pkware competitors archive#

If an archive was created in PKARC, could that archive be opened by SEA's ARC, or did it specifically *require* PKXARC ? 86.25.121.61 ( talk) 08:26, 24 October 2011 (UTC) I'm reasonably certain that there was file format compatibility. AnonMoos ( talk) 00:28, 30 January 2010 (UTC) Was PKXARC *NECESSARY* to read files made by PKARC ?

#Pkware competitors zip#

ZIP's status as the replacement to ARC wasn't really sealed until after Zip 1.93a (with the deflate algorithm) was released in 1991 before that time, Lharc, Arj, another (non-PKWare) Pak program etc.

#Pkware competitors free#

I doubt whether it was strictly necessary for SEA to win its court case, and it created a huge negative backlash among the user community and allowed Phil Katz to be the good guy by declaring that the APPNOTE.TXT specification was free for anyone to implement.Īlso, the sentence which was recently added to the end oversimplifies the compression wars of the early 1990s. There could be more said about SEA's decision to retroactively declare the ARC file format to be closed and proprietary. Who is it? -Preceding unsigned comment added by 68.207.123.4 ( talk) 20:44, 25 July 2008 (UTC) File format Snogglethorpe ( talk) 23:14, 9 March 2008 (UTC) Henderson? The phrase near the end "Henderson moved back to Virginia" seems very odd - there's no previous mention of him being anywhere else, and in any case, his physical location seem irrelevant to the subject of the article. A correction would be nice, the other article has some good references to sources on the case for exact details.

#Pkware competitors code#

The other article mentions SEA won the legal case and calls the code 'plagiarised', while in this article it is not mentioned SEA won the case, nor is it very clear that what PKWARE did was indeed considered illegal. The text here seems to contradict (or at least fails to mention important facts ) with the PKZIP article. The only reference to the layout of the file that I've found is here (the file named "arcfsdata"): The Acorn Computer had a file archive type called ArcFS, which also used the "arc" extension. I think Thom Henderson runs his own ISP nowadays, right?Īrmslurp 14:34, 26 June 2006 (UTC) Also, from what I've read, ARC replaced the LBR+SQ combo. SEA was a very small company that needed others to port ARC to non-DOS platforms, so that's why they released the source. ARC was (supposedly?) free for non-commercial use, and 2). Raduga 01:04, 15 February 2006 (UTC) ĭidn't later versions of ARC support archiving directories? What exactly was the last version of ARC, 7.0?īTW, don't forget to mention that: 1). If not for the SEA lawsuit, it might well have eventually spread to the USĪnd pushed out ARC, but its timing seems incidental LZH/LHA didn't enter into common use in the US/Europe until after PKZIP was established. LZH/LHA was developed independently by computer scientists in Japan ZIP, ZOO, then ARJ, ACE and others all stem from the lineage of products competing with ARC and most were commercial or shareware in origin.

Were much less efficient than the algorithms ZIP uses today.ĪRC was the first common format in wide use on the PC.

The original ZIP algorithms, for that matter, Legal woes that Phil Katz and other suffered, spurred them to develop better,Ĭompeting archive formats. SEA's ARC had excellent compression, for the time it was released. There were several others, I could probably dig up more references if requested. ARC were used that had no relation to SEA. ARC was almost exclusively used by SEA's (and PK's)Ĭompressors but on other computer architectures. It seems, as if the author of FreeArc tried to design a complete replacement for the old Arc. The console program of FreeArc uses similar command options as old DOS and CP/M archivers. Obviously, those two arc-files are completely different. I checked that format for use with the old ARC compression program by SEA, and it didn't work. arc" for all of its output files, no matter the compression. It had pretty bad compression ratio so it died as soon as better alternatives showed up, primarily "lharc" (or "lha").Īre there any examples of other archiving programs using the extension "arc"? "arc" was a very specific archiving format similar to zip and various others. I believe that the current description is completely wrong.