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Apache 2.0 license

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License

The Apache 2.0 license is a permissive open-source software license maintained by the Apache Software Foundation. It grants users the freedom to use, modify, and distribute software under its terms, while providing explicit patent protections to licensees. The license is compatible with many other open-source licenses and is widely used across various software projects and frameworks.

Key Characteristics

The Apache 2.0 license requires that modified versions of the software include a notice of changes made to the original code. Users must also provide a copy of the license and any applicable notices with distributions of the software. The license explicitly grants patent rights from contributors, which protects downstream users from patent infringement claims related to the licensed code. Additionally, the Apache 2.0 license includes a warranty disclaimer and limitation of liability clause, clarifying that the software is provided “as is” without guarantees.

Usage and Compatibility

Apache 2.0 is one of the most widely adopted permissive licenses in the software industry, used by projects ranging from infrastructure tools to web frameworks. It is compatible with the GNU General Public License version 3 (GPLv3) in one direction, meaning Apache 2.0 code can be incorporated into GPLv3 projects, though the reverse is not always straightforward. The license strikes a balance between providing freedom to users and protecting contributors from liability.

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