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@@ -0,0 +1,155 @@ +Copyright (c) 1990-2005 Info-ZIP. All rights reserved. + +See the accompanying file LICENSE, version 2005-Feb-10 or later +(the contents of which are also included in zip.h) for terms of use. +If, for some reason, both of these files are missing, the Info-ZIP license +also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html + +This is Zip 2.31, a maintenance update for Zip 2.3. Changes include a +few bug fixes for Debian and SourceForge bugs, inclusion of the standard +zip encryption code in the main code, some VMS updates, some changes to +the Win32 projects, and some other bug fixes. We are also working on +the new Zip 3.0 and companion UnZip 6.00 that finally support files and +archives larger than 4 GB on systems that support large files and include +other new features. See the latest betas for details and the new releases +when available. + +Zip 2.31 is a compression and file packaging utility. It is compatible with +PKZIP 2.04g (Phil Katz ZIP) for MSDOS systems. There is a companion to zip +called unzip (of course) which you should be able to find the same place +you got zip. See the file 'WHERE' for details on ftp sites and mail +servers. + +This version of zip has been ported to a wide array of Unix and other +mainframes, minis, and micros including VMS, OS/2, Minix, MSDOS, Windows NT, +Atari, Amiga, BeOS and VM/CMS. Although highly compatible with PKware's +PKZIP and PKUNZIP utilities of MSDOS fame, our primary objective has been +one of portability and other-than-MSDOS functionality. Features not found +in the PKWare version include creation of zip files in a pipe or on a +device, VMS, BeOS and OS/2 extended file attributes, conversion from Unix to +MSDOS text file format; and, of course, the ability to run on most of your +favorite operating systems. And it's free. + +See the file WhatsNew for a summary of new features and the file 'CHANGES' for +a detailed list of all changes. + +This version does not support multi-volume archives as in pkzip 2.04g. +This is currently being looked at and may be provided in the release of +Zip 3.0 if time permits. + +Please read the file INSTALL for information on how to compile and install +zip, zipsplit, zipcloak, and zipnote. Please read the file MANUAL for +information on how to use them. The file "contents" is a complete list +of the files you should have in this distribution. Also, if you are +using MSDOS, you should read the note on file formats at the end of the +contents file. (The contents file somehow got misplaced apparently in +the Zip 2.3 distribution. If time permits we will create a new one.) + +This version supports standard zip encryption. The encryption code was +distributed separately before this version because of US export regulations but +recent relaxing of export restrictions now allow the code to be included. Note +that standard zip encryption is considered weak by today's standards. We are +looking at adding strong encryption to a later release. Decryption can be made +with unzip 5.0p1 or later, or with zipcloak. + +All bug reports should go to zip-bugs using the web form at www.info-zip.org, +and suggestions for new features can be sent using the same form (although +we don't promise to use all suggestions). Contact us to send patches as we +currently don't have a standard way to do that. Patches should be sent as +context diffs only (diff -c). + +If you're considering a port, please check in with zip-bugs FIRST, +since the code is constantly being updated behind the scenes. We'll +arrange to give you access to the latest source. + +If you'd like to keep up to date with our Zip (and companion UnZip utility) +development, join the ranks of BETA testers, add your own thoughts and con- +tributions, etc., send a two-line mail message containing the commands HELP +and LIST (on separate lines in the body of the message, not on the subject +line) to mxserver@lists.wku.edu. You'll receive two messages listing the +various Info-ZIP mailing-list formats which are available (and also various +unrelated lists) and instructions on how to subscribe to one or more of them +(courtesy of Hunter Goatley). (Currently these are all discontinued but +we are considering implementing new versions. However, a discussion +group for Info-ZIP issues is at http://www.quicktopic.com/27/H/V6ZQZ54uKNL +and can be used to discuss issues, request features, and is one place new +betas and releases are announced.) + +Frequently asked questions on zip and unzip: + +Q. When unzipping I get an error message about "compression method 8". + +A. Please get the latest version of unzip. See the file 'WHERE' for details. + + +Q. I can't extract this zip file that I just downloaded. I get + "zipfile is part of multi-disk archive" or some other message. + +A. Please make sure that you made the transfer in binary mode. Check + in particular that your copy has exactly the same size as the original. + + +Q. When running unzip, I get a message about "End-of-central-directory + signature not found". + +A. This usually means that your zip archive is damaged, or that you + have an uncompressed file with the same name in the same directory. + In the first case, it makes more sense to contact the person you + obtained the zip file from rather than the Info-ZIP software + developers, and to make sure that your copy is strictly identical to + the original. In the second case, use "unzip zipfile.zip" instead + of "unzip zipfile", to let unzip know which file is the zip archive + you want to extract. + + +Q. Why doesn't zip do <something> just like PKZIP does? + +A. Zip is not a PKZIP clone and is not intended to be one. In some + cases we feel PKZIP does not do the right thing (e.g., not + including pathnames by default); in some cases the operating system + itself is responsible (e.g., under Unix it is the shell which + expands wildcards, not zip). Info-ZIP's and PKWARE's zipfiles + are interchangeable, not the programs. + + For example, if you are used to the following PKZIP command: + pkzip -rP foo *.c + you must use instead on Unix: + zip -R foo '*.c' + (the singled quotes are needed to let the shell know that it should + not expand the *.c argument but instead pass it on to the program) + + +Q. Can I distribute zip and unzip sources and/or executables? + +A. You may redistribute the latest official distributions without any + modification, without even asking us for permission. You can charge + for the cost of the media (CDROM, diskettes, etc...) and a small copying + fee. If you want to distribute modified versions please contact us at + zip-bugs at www.info-zip.org first. You must not distribute beta versions. + The latest official distributions are on ftp.info-zip.org in directory + /pub/archiving/zip and subdirectories as well as on mirror sites. + + +Q. Can I use the executables of zip and unzip to distribute my software? + +A. Yes, so long as it is made clear in the product documentation that + zip or unzip are not being sold, that the source code is freely + available, and that there are no extra or hidden charges resulting + from its use by or inclusion with the commercial product. Here is + an example of a suitable notice: + + NOTE: <Product> is packaged on this CD using Info-ZIP's compression + utility. The installation program uses UnZip to read zip files from + the CD. Info-ZIP's software (Zip, UnZip and related utilities) is + free and can be obtained as source code or executables from various + anonymous-ftp sites, including ftp.info-zip.org:/pub/archiving/zip/*. + + +Q. Can I use the source code of zip and unzip in my commercial application? + +A. Yes, so long as you include in your product an acknowledgment and an + offer of the original compression sources for free or for a small + copying fee, and make clear that there are no extra or hidden charges + resulting from the use of the compression code by your product. In other + words, you are allowed to sell only your own work, not ours. If you have + special requirements contact us at zip-bugs at www.info-zip.org. |