What is UPX?

Ultimate Packer for Xecutables (UPX) is an extendable software high-performance executable file compression packer for a number of diverse executable file formats. It achieves an excellent file compression ratio and fast running decompression. The UPX executables suffer no memory overhead or negatives. An ongoing audit of compressed and uncompressed files is maintained.

UPX can easily compress these executable file formats:
atari/tos, djgpp2/coff, dos/com, dos/exe, dos/sys, linux/i386, rtm32/pe, tmt/adam, watcom/le and win32/pe.

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The Ultimate Packer for eXecutables: Copyright © 1996-2000 Markus Oberhumer & Laszlo Molnar http://wildsau.idv.uni-linz.ac.at/mfx/upx.html http://www.nexus.hu/upx http://upx.tsx.org READ THIS UPX LICENSE AGREEMENT - ESPECIALLY IF YOU PLAN TO CHANGE UPX SOURCE CODE OR USE A MODIFIED UPX VERSION. ABSTRACT ======== UPX and UCL are copyrighted © software distributed under the terms of the GNU General Public License (hereinafter the "GPL"). The stub imbedded in each UPX compressed program is part of UPX and UCL, and contains code that is under our copyright. Terms of the GNU General Public License still apply as compressing a program is a special form of linking with our stub. As a special exception we grant the free usage of UPX for all executables, including commercial programs. See below for details and restrictions: COPYRIGHT ========= UPX and UCL are copyrighted software. All rights remain with the authors. UPX is Copyright © 1996-2000 Markus Franz Xaver Johannes Oberhumer UPX is Copyright © 1996-2000 Laszlo Molnar UCL is Copyright © 1996-2000 Markus Franz Xaver Johannes Oberhumer GNU GENERAL PUBLIC LICENSE ========================== UPX and the UCL library are free software; you can redistribute them and/or modify them under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. UPX and UCL are distributed in the hope that they will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; see the file COPYING. SPECIAL EXCEPTION FOR COMPRESSED EXECUTABLES ============================================ The stub which is imbedded in each UPX compressed program is part of UPX and UCL, and contains programming code under our copyright. The terms of the GNU General Public License still apply as compressing a program is a special form of linking with our stub. Hereby Markus F.X.J. Oberhumer and Laszlo Molnar grant you special permission to freely use and distribute all UPX compressed programs (including commercial ones), subject to the following restrictions: 1. You must compress your program with a completely unmodified UPX version; either with our precompiled version, or (at your option) with a self compiled version of the unmodified UPX sources as distributed by us. 2. This also implies that the UPX stub must be completely unmodfied, i.e. the stub imbedded in your compressed program must be byte-identical to the stub that is produced by the official unmodified UPX version. 3. The decompressor and any other code from the stub must exclusively get used by the unmodified UPX stub for decompressing your program at program startup. No portion of the stub may get read, copied, called or otherwise get used or accessed by your program. ANNOTATIONS =========== - You can use a modified UPX version or modified UPX stub only for programs that are compatible with the GNU General Public License. - We grant you special permission to freely use and distribute all UPX compressed programs. But any modification of the UPX stub (such as, but not limited to, removing our copyright string or making your program non-decompressible) will immediately revoke your right to use and distribute a UPX compressed program. - UPX is not a software protection tool; by requiring you use the unmodified UPX version for your proprietary programs we make sure that any user can decompress your program. This protects both you and your users as nobody can hide malicious code - any program that cannot be decompressed is highly suspicious by definition. - You can integrate all or part of UPX and UCL into projects that are compatible with the GNU GPL, but obviously you may not grant any special exceptions beyond the GPL for our code in your project. - We want to actively support manufacturers of virus scanners and similar security software including spyware programs. Please contact us if you want to incorporate parts of UPX or UCL into such a product. Markus F.X.J. Oberhumer Laszlo Molnar markus.oberhumer@jk.uni-linz.ac.at ml1050@cdata.tvnet.hu Linz, Austria.

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