zlib license

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The zlib / libpng license is one of the Open Source Initiative and the Free Software Foundation recognized (FSF) Permissive open source license . According to the FSF, it is also compatible with the GNU General Public License (GPL).

It implies that the author of the software assumes no liability for any damage resulting from the use of the same. The use of the software is free for all, i.e. also for commercial purposes, under the following three conditions:

  1. You cannot claim that you are the author of the software. If it is used in a product, a mention in the documentation is desirable, but not required.
  2. A changed source code must also be marked as such and may not be named as the original source.
  3. The license notice must not be removed

Like the BSD license, the Zlib license does not contain a copyleft .

As with most free licenses, the license contains a disclaimer that does not distinguish between willful intent and negligence. This does not apply under German law. However, if the software is provided free of charge, § 521 BGB applies , according to which liability is only assumed for intent and gross negligence.

use

Originally, for licensing the zlib (the backend of under Unix systems widely used gzip - Compression is) designed the zlib license is now used by numerous independent projects. Some of the better known are:

License text

Original text

Analogous translation

Copyright (c) <year> < copyright holder >

This software is provided 'as-is', without any express or implied warranty. In no event, the authors will be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
 Copyright (c) <year> < copyright holder >

This software is provided without any warranty, express or implied. Under no circumstances can the authors be held liable for any damage caused by using this software.

Everyone is permitted to use this software for any purpose, including commercial applications, to modify it and to redistribute it freely, provided that the following conditions are met:

  1. The origin of this software must not be misrepresented; You are not allowed to state that you wrote the original software. If you used this software in a product, a mention would be appreciated but is not required.
  2. Changed source code versions must be clearly marked as such and may not be represented as the original software.
  3. This note may not be changed or deleted in the source texts.

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