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- Copyright (C) 1990-1996 Mark Adler, Richard B. Wales, Jean-loup Gailly,
- Onno van der Linden, Kai Uwe Rommel, Igor Mandrichenko and John Bush.
- Permission is granted to any individual or institution to use, copy, or
- redistribute this software so long as all of the original files are included,
- that it is not sold for profit, and that this copyright notice is retained.
-
-
- Zip 2.1 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 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
- 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 'history' for a detailed list of all changes.
-
- This version does not support multi-volume archives as in pkzip 2.04g.
- This may be provided in a future version if time permits.
-
- Please read the file install.doc for information on how to compile and
- install zip, zipsplit and zipnote. Please read the file zip.doc 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.
-
- This version supports encryption, but the encryption code is distributed
- separately because of the US export regulations. See the file 'Where'
- for access to the encryption code. Decryption can be made with unzip 5.0p1
- or later, or with zipcloak (which is provided in the encryption supplement).
-
- All bug reports or patches should go to zip-bugs@wkuvx1.wku.edu, and
- suggestions for new features can be sent to info-zip@wkuvx1.wku.edu
- (although we don't promise to use all suggestions). 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@wkuvx1.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).
-
- 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 . -i \*.c
- (PKZIP does not allow recursion in directories other than the
- current one. zip does, this is why the syntax is different.)
-
-
- 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@wkuvx1.wku.edu first. You must not distribute beta versions.
- The latest official distributions are always on ftp.uu.net in directory
- /pub/archiving/zip and subdirectories.
-
-
- 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.uu.net:/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@wkuvx1.wku.edu.
-