GPL30

GPL30 is often used as shorthand for the GNU General Public License version 3.0 (GPL-3.0), a free software license published by the Free Software Foundation (FSF) in 2007. It was designed to address challenges of modern software distribution, including devices and networks, by implementing a strong copyleft that aims to preserve user freedoms in derivative works.

Core terms of GPL-3.0 require that when distributing the program, recipients receive access to the complete corresponding source code. Derivative works must be licensed under GPL-3.0 (or, at the distributor’s option, under GPL-3.0 or any later version published by the FSF). The license also prohibits adding restrictions beyond those in GPL-3.0 and ensures freedom to study, modify, and share the software.

A notable aspect of GPL-3.0 is its stance on hardware and digital restrictions. It includes provisions intended to prevent tivoization and discourages the use of digital rights management to restrict users from running modified versions of the software. It also contains a patent license from contributors to recipients and a mechanism (patent retaliation clause) to deter patent threats that could undermine user freedoms.

Compatibility with other licenses is nuanced. GPL-3.0 is not universally compatible with all licenses, and some licenses require explicit exceptions or dual licensing to be combined with GPL-3.0 code. For historical reasons, the Linux kernel continues to be released under GPL-2.0-only, rather than GPL-3.0, reflecting its long-standing licensing choice.

GPL-3.0 remains widely used for libraries, applications, and middleware in the free software ecosystem, and it continues to shape discussions around software freedom, licensing strategy, and user rights.