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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 widely adopted across software projects, frameworks, and tools due to its clear terms and compatibility with many other open-source licenses.

Key Requirements and Terms

Apache 2.0 requires that modified versions of the software include a notice of the changes made. Distributors must retain all copyright, patent, trademark, and attribution notices from the original source. The license also mandates that any redistributed copies of the software must include a copy of the license itself.

Patent Protection

A defining feature of the Apache 2.0 license is its explicit grant of patent rights. Contributors automatically grant users a perpetual, worldwide, non-exclusive, royalty-free license to any patents held by the contributor that are necessarily infringed by the contributed code. This provision aims to protect users from patent litigation by contributors who later claim their contributions infringe on their own patents.

Compatibility and Adoption

The license is known for its business-friendly nature and broad compatibility with other major open-source licenses, including the GNU General Public License (GPL). This compatibility allows Apache 2.0 licensed code to be incorporated into projects under different licensing schemes, facilitating widespread adoption in both open-source and commercial software development environments.

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