From 2015[update], according to Black Duck software and GitHub, the Apache license is the third most popular license in the FOSS field after the MIT and GPLv2 license. The Apache 2.0 license ensures that the user does not have to worry about patent infringement using the software. The user obtains a license for any patent that covers the software. This license is terminated if the user sues someone for patent infringement under this software. This condition is added to avoid patent litigation. Apache Software Foundation uses various licenses to distribute software and documentation, accept regular contributions from individuals and businesses, and accept larger grants for existing software. The Free Software Foundation considers that all versions of the Apache license are incompatible with previous versions of GPL 1 and 2  In addition, it considers the Apache pre 2.0 license versions to be incompatible with GPLv3. Due to the patent licensing requirements of Version 2.0, the Free Software Foundation recommends doing so in relation to other non-copyleft licenses.  The content of the NOTICE file does not change the license because it is used only for informational purposes, and the addition of other attribution notes as an addendum to the NOTICE text is permitted, unless such communications can be construed as a change in the license.
Changes may contain copyright terms and include different licensing conditions for changes. Starting in 1995, the Apache Group (later the Apache Software Foundation) published successive versions of its famous httpd server. Their original license was much the same as the old BSD 4-clause license, and only the names of the organizations were changed. It has an additional term that applies to clause BSD 4 and stipulates that derivatives must not bear the same Apache name. It is not legal advice. Learn more about filing licenses. In July 1999, Berkeley accepted the Free Software Foundation`s argument and withdrew its advertising clause (Clause 3) to form the new BSD 3-Clause license. In 2000, Apache also created the Apache 1.1 license, where derivatives are no longer required to include Attribution in their promotional material, but only in their documentation.
Some licensed packages under version 1.1 may have used different formulations due to different imputation or brand identification requirements, but the mandatory conditions were all the same. The Apache license is a free free software license, written by the Apache Software Foundation (ASF).  It allows users to use the software for any use, distribute it, modify it and distribute modified versions of the software under the terms of the license, regardless of royalties. The ASF and its projects publish their software products under the Apache license. The license is also used by many non-ASF projects. These licenses help us achieve our goal of providing reliable and sustainable software products through the development of collaborative open-source software. In all cases, contributors reserve the right to use their original messages for other purposes outside of Apache, while granting ASF and its projects the right to distribute and build their work within Apache. Any software produced by Apache Software Foundation or any of its projects or themes is authorized according to the terms and conditions of the Apache license, version 2.0 (current). Apache Software Foundation and the Free Software Foundation agree that the Apache 2.0 license is a free software license compatible with the gnu General Public License (GPL) version 3,, which means that the code can be combined under GPLv3 and Apache License 2.0 as long as the resulting software is licensed GPLv3.  This is a licensing agreement between you. , an end-user of computer software, and DS Data Systems (UK) Ltd (`DS Data Systems`).