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- Copyright (C) 1990-1992 Mark Adler, Richard B. Wales, Jean-loup Gailly,
- Kai Uwe Rommel and Igor Mandrichenko.
- 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
- unmodified, that it is not sold for profit, and that this copyright notice
- is retained.
-
-
- Zip 1.9 is a compression and file packaging utility. It is analogous to a
- combination of tar and compress and is compatible with PKZIP 1.93a
- (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, and Macintosh (the latter two have not been tested
- recently). 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.
-
- If you got this file from zip19.zip, you can extract the rest only
- with unzip 5.0 or pkzip 1.93a. See the file 'Where' if you do not
- have them already.
-
- 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 5.0
- or later, or with zipcloak (which is provided in the encryption supplement).
-
- All bug reports and patches should go to zip-bugs@cs.ucla.edu, and
- suggestions for new features can be sent to info-zip@cs.ucla.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. The alternative is the
- possibility that your hard work will be tucked away in a sub-archive
- and pretty much ignored. A port to VM/CMS would be welcome.
-
- 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
- contributions, etc., send your request to Info-ZIP-Request@cs.ucla.edu and
- you will be added to the Info-ZIP newsletter mailing list.
-
-
- IMPORTANT NOTES:
-
- - pkzip 1.93a is only an alpha version (see historical notes below). If
- you wish to create zip files compatible with the official version of
- pkzip (1.10), you must use zip 1.0. zip 1.9 cannot create files
- with the old compression method (implosion).
-
- - zip 1.9 is is compatible with pkzip 1.93a, except when two features
- are used: encryption or zip file created in a pipe or on a non
- seekable device. pkzip versions of 2.0 will support such files, and
- unzip 5.0 already supports them. (Thanks to Phil Katz for accepting
- our suggested minor changes to the zip file format.)
-
- - the ports to the Macintosh and the Atari ST have been provided in
- the hope that they can be useful, but they have been adapted from an
- older version of zip (1.0) and are still completely untested. A
- makefile is still missing for the Mac. Another Macintosh port is
- being made by Johnny Lee <johnnyl@microsoft.com> but it requires
- more substantial changes so it will be distributed separately.
-
- - Please read the file zip.doc, and in particular its list of known bugs
- at the end.
-
- Historical notes:
-
- At the time of release of zip 1.9, the official released version of
- PKZIP is version 1.10. PKZIP 1.93a is only an alpha version, which was
- released in October 1991. It was supposed to be replaced soon after
- with an official release of pkzip 2.0. However, Phil Katz has not yet
- announced a release date at the time of writing (Aug 19th, 1992).
-
- Beta versions of zip compatible with pkzip 1.93a have been available
- since February 1992 to the info-zip group (see the file 'history').
- The zip authors would have preferred to release zip 2.0 only after
- pkzip 2.0(*), to ensure full compatibility in case of archive format
- changes between pkzip 1.93a and 2.0. However we feel that we cannot
- delay any further the release of zip 1.9, since all the major features
- that we wanted to put in are now available and well tested by the
- info-zip group.
-
- (*) The version number for the new pkzip was planned to be 2.00, but may
- be increased to a number greater than 2.2 to prevent confusion with
- several bogus versions, which may destroy all the data on your hard
- disk if you run them.
-