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John the Ripper copyright and license.

John the Ripper password cracker, Copyright (c) 1996-2019 by Solar Designer.

This program is free software; you can redistribute it and/or modify it 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.

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. See the GNU General Public License for more details.

As a special exception to the GNU General Public License terms, permission is hereby granted to link the code of this program, with or without modification, with any version of the OpenSSL library and/or any version of unRAR, and to distribute such linked combinations. You must obey the GNU GPL in all respects for all of the code used other than OpenSSL and unRAR. If you modify this program, you may extend this exception to your version of the program, but you are not obligated to do so. (In other words, you may release your derived work under pure GNU GPL version 2 or later as published by the FSF.)

(This exception from the GNU GPL is not required for the core tree of John the Ripper, but arguably it is required for -jumbo.)

Relaxed terms for certain components.

In addition or alternatively to the license above, many components are available to you under more relaxed terms (most commonly under cut-down BSD license) as specified in the corresponding source files.

Furthermore, as the copyright holder for the bcrypt (Blowfish-based password hashing) implementation found in John the Ripper, I have placed a derived version of this implementation in the public domain. This derived version may be obtained at:

The intent is to provide modern password hashing for your servers and your software (where the GPL restrictions could be a problem).

Commercial licensing.

Commercial licenses (non-GPL) are available upon request.

Copyright holder contact information.

For the core John the Ripper tree:

Alexander Peslyak aka Solar Designer <solar at>

(There are additional copyright holders for "community enhanced" -jumbo versions of John the Ripper.)

$Owl: Owl/packages/john/john/doc/LICENSE,v 1.18 2019/05/19 15:14:35 solar Exp $