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https://github.com/upx/upx

UPX - the Ultimate Packer for eXecutables
https://github.com/upx/upx

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UPX - the Ultimate Packer for eXecutables

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README 

        
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                    The Ultimate Packer for eXecutables

   Copyright (c) 1996-2024 Markus Oberhumer, Laszlo Molnar & John Reiser

                           https://upx.github.io



WELCOME

=======



Welcome to UPX !



UPX is a free, secure, portable, extendable, high-performance

executable packer for several executable formats.



INTRODUCTION

============



UPX is an advanced executable file compressor. UPX will typically

reduce the file size of programs and DLLs by around 50%-70%, thus

reducing disk space, network load times, download times and

other distribution and storage costs.



Programs and libraries compressed by UPX are completely self-contained

and run exactly as before, with no runtime or memory penalty for most

of the supported formats.



UPX supports a number of different executable formats, including

Windows programs and DLLs, and Linux executables.



UPX is free software distributed under the term of the GNU General

Public License. Full source code is available.



UPX may be distributed and used freely, even with commercial applications.

See the UPX License Agreements for details.



SECURITY CONTEXT

================



IMPORTANT NOTE: UPX inherits the security context of any files it handles.



This means that packing, unpacking, or even testing or listing a file requires

the same security considerations as actually executing the file.



Use UPX on trusted files only!



SHORT DOCUMENTATION

===================



'upx program.exe' will compress a program or DLL. For best compression

results try 'upx --best program.exe' or 'upx --brute program.exe'.



Please see the file UPX.DOC for the full documentation. The files

NEWS and BUGS also contain various tidbits of information.



THE FUTURE

==========



  - Stay up-to-date with ongoing OS and executable format changes



  - RISC-V 64 for Linux



  - ARM64 for Windows (help wanted)



  - We will *NOT* add any sort of protection and/or encryption.

    This only gives people a false feeling of security because

    all "protectors" can be broken by definition.



  - Fix all remaining bugs - please report any issues

    https://github.com/upx/upx/issues



COPYRIGHT

=========



Copyright (C) 1996-2024 Markus Franz Xaver Johannes Oberhumer

Copyright (C) 1996-2024 Laszlo Molnar

Copyright (C) 2000-2024 John F. Reiser



UPX is distributed with full source code under the terms of the

GNU General Public License v2+; either under the pure GPLv2+ (see

the file COPYING), or (at your option) under the GPLv+2 with special

exceptions and restrictions granting the free usage for all binaries

including commercial programs (see the file LICENSE).



This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.



You should have received a copy of the UPX License Agreements along

with this program; see the files COPYING and LICENSE. If not,

visit the UPX home page.



Share and enjoy,

Markus & Laszlo & John



   Markus F.X.J. Oberhumer              Laszlo Molnar

                  



   John F. Reiser

   



[ The term UPX is a shorthand for the Ultimate Packer for eXecutables

  and holds no connection with potential owners of registered trademarks

  or other rights. ]