Apache License

Apache 2.0ApacheApache License 2.0Apache 2.0 licenseApache 2.0 LicenceApache 2 licenseApache License version 2.0Apache 2Apache License, Version 2.0Apache License, v2.0
The Apache License is a permissive free software license written by the Apache Software Foundation (ASF).wikipedia
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Permissive software licence

permissivepermissive licensepermissive free software license
The Apache License is a permissive free software license written by the Apache Software Foundation (ASF). The Apache License is permissive in that it does not require a derivative work of the software, or modifications to the original, to be distributed using the same license (unlike copyleft licenses – see comparison).
Examples include the MIT License, BSD licenses, Apple Public Source License and the Apache license.

The Apache Software Foundation

ApacheASFApache Software Foundation
The Apache License is a permissive free software license written by the Apache Software Foundation (ASF).
The software they produce is distributed under the terms of the Apache License and is free and open-source software (FOSS).

Free software license

free softwarefree software licencefree software licenses
The Apache License is a permissive free software license written by the Apache Software Foundation (ASF). Like other free software licenses, the license allows the user of the software the freedom to use the software for any purpose, to distribute it, to modify it, and to distribute modified versions of the software, under the terms of the license, without concern for royalties. The Apache Software Foundation and the Free Software Foundation agree that the Apache License 2.0 is a free software license, compatible with version 3 of the GNU General Public License (GPL), meaning that code under GPL version 3 and Apache License 2.0 can be combined, as long as the resulting software is licensed under the GPL version 3.
In 2015 according to Black Duck Software and GitHub statistics, the permissive MIT license dethroned the GPLv2 as most popular free-software license to the second place while the permissive Apache license follows already at third place.

License compatibility

compatibleincompatiblecompatibility
The stated goals of the license included ''making the license easier for non-ASF projects to use, improving compatibility with GPL-based software, allowing the license to be included by reference instead of listed in every file, clarifying the license on contributions, and requiring a patent license on contributions that necessarily infringe a contributor's own patents''.
This "one-way compatibility" characteristic has been criticized by the Apache Foundation, which licenses under the more permissive Apache license, such non-copyleft licenses being often less complicated and making for better license compatibility.

SourceForge

sourceforge.netJanuary 2011 attacks on SourceForge.netsf.net
In October 2012, 8,708 projects located at SourceForge.net were available under the terms of the Apache License.
In 2009 SourceForge announced a new site platform known as Allura, which would be an extensible, open source platform licensed under the Apache License, utilizing components such as Python and MongoDB, and offering REST APIs.

Android (operating system)

AndroidAndroid operating systemAndroid OS
In a blog post from May 2008, Google mentioned that over 25% of the nearly 100,000 projects then hosted on Google Code were using the Apache License, including the Android operating system.
The core Android source code is known as Android Open Source Project (AOSP), and is primarily licensed under the Apache License.

Copyleft

copyleft licenseweak copyleftby-nc-sa
The Apache License is permissive in that it does not require a derivative work of the software, or modifications to the original, to be distributed using the same license (unlike copyleft licenses – see comparison).
Examples of non-copyleft ("permissive") free-software licenses include the X11 license, Apache license and the BSD licenses.

Free and open-source software

free and open-sourcefree and open source softwarefree and open source
, according to Black Duck Software and GitHub, the Apache license is the third most popular license in the FOSS domain after MIT license and GPLv2.
Also in 1995, The Apache HTTP Server, commonly referred to as Apache, was released under the Apache License 1.0.

Comparison of free and open-source software licenses

free software licensescomparisonfree and open source software licenses
The Apache License is permissive in that it does not require a derivative work of the software, or modifications to the original, to be distributed using the same license (unlike copyleft licenses – see comparison).
The OSI recommends a mix of permissive and copyleft licenses, the Apache License 2.0, 2- & 3-clause BSD license, GPL, LGPL, MIT license, MPL 2.0, CDDL and EPL.

Google Developers

Google Codecode.google.comdeveloper products
In a blog post from May 2008, Google mentioned that over 25% of the nearly 100,000 projects then hosted on Google Code were using the Apache License, including the Android operating system.
The service was available and free for all OSI-approved Open Source projects (as of 2010, it was strongly recommended but no longer required to use one of the nine well-known open source licenses: Apache, Artistic, BSD, GPLv2, GPLv3, LGPL, MIT, MPL and EPL).

GNU General Public License

GPLGNU GPLGPLv2
The stated goals of the license included ''making the license easier for non-ASF projects to use, improving compatibility with GPL-based software, allowing the license to be included by reference instead of listed in every file, clarifying the license on contributions, and requiring a patent license on contributions that necessarily infringe a contributor's own patents''. , according to Black Duck Software and GitHub, the Apache license is the third most popular license in the FOSS domain after MIT license and GPLv2. The Apache Software Foundation and the Free Software Foundation agree that the Apache License 2.0 is a free software license, compatible with version 3 of the GNU General Public License (GPL), meaning that code under GPL version 3 and Apache License 2.0 can be combined, as long as the resulting software is licensed under the GPL version 3.
It introduced Apache License version 2.0 compatibility (prior versions are incompatible), clarified the role of outside contractors, and made an exception to avoid the perceived problems of a Microsoft–Novell style agreement, saying in Section 11 paragraph 6 that:

MIT License

MITMIT/X11X11
, according to Black Duck Software and GitHub, the Apache license is the third most popular license in the FOSS domain after MIT license and GPLv2.
A similarly permissive license, which includes an explicit contributor's patent license, is the Apache License version 2.0+.

OpenBSD

PuffyhttpdOpenBSD kernel
The OpenBSD project does not consider the Apache License 2.0 to be an acceptable license due to its patent provisions.
The widely used Apache License and GNU General Public License are considered overly restrictive.

Copyright

copyright lawcopyrightscopyrighted
The Apache License, Version 2.0 requires preservation of the copyright notice and disclaimer.

Disclaimer

disclaimersdisclaimlegal disclaimer
The Apache License, Version 2.0 requires preservation of the copyright notice and disclaimer.

Royalty payment

royaltiesroyaltyroyalty payments
Like other free software licenses, the license allows the user of the software the freedom to use the software for any purpose, to distribute it, to modify it, and to distribute modified versions of the software, under the terms of the license, without concern for royalties.

Reasonable and non-discriminatory licensing

RANDreasonable and non-discriminatoryFRAND
This makes the Apache License a FRAND-RF license.

Derivative work

derivative worksderivativederivatives
The Apache License is permissive in that it does not require a derivative work of the software, or modifications to the original, to be distributed using the same license (unlike copyleft licenses – see comparison).

Free Software Foundation

FSFfree software communityFree Software Foundation's high priority list
The Apache Software Foundation and the Free Software Foundation agree that the Apache License 2.0 is a free software license, compatible with version 3 of the GNU General Public License (GPL), meaning that code under GPL version 3 and Apache License 2.0 can be combined, as long as the resulting software is licensed under the GPL version 3.

Google

Google Inc.Google, Inc.Googling
In a blog post from May 2008, Google mentioned that over 25% of the nearly 100,000 projects then hosted on Google Code were using the Apache License, including the Android operating system.

GitHub

github.comGistOctocat
, according to Black Duck Software and GitHub, the Apache license is the third most popular license in the FOSS domain after MIT license and GPLv2.

Comparison of database tools

database toolmulti-database query, design, and database comparison tool

Tesseract (software)

TesseractTesseract OCRTesseract-OCR
It is free software, released under the Apache License, Version 2.0, and development has been sponsored by Google since 2006.

IntelliJ IDEA

IntelliJIDEAIntelliJ IDE
It is developed by JetBrains (formerly known as IntelliJ), and is available as an Apache 2 Licensed community edition, and in a proprietary commercial edition.

AllJoyn

Within the merging process, the project's licence was changed to the Apache 2.0 Licence which makes it easier for other open source projects to include AllJoyn.