Copyleft licenses, in turn, come in two flavors: strong and weak. Open source software licenses fall into two categories: permissive and copyleft. So, what makes Mozilla Public License 2.0 distinctive, and why might an OSS user or author like the MPL 2.0? We’ll address these questions and more below. Often termed a “weak copyleft” license, MPL 2.0 falls somewhere in the middle. The MPL 2.0 is neither a permissive license like the MIT License (which allows for use of the licensed code with very few restrictions) nor a strong copyleft license like the GPL v2 License (which places numerous restrictions on use). Over a decade later, in 2010, Mozilla Public License 2.0 made its debut, and has remained the MPL of choice ever since. Version 1.0 of the Mozilla Public License (MPL) was released in 1998, with a slightly modified Version 1.1 introduced the following year. It’s therefore no surprise that the Mozilla Foundation has created its own open source license, the Mozilla Public License. Open source software contributors, however, may also know Mozilla for its commitment to keeping the internet a free and public resource, a mission that matches the ethos of OSS development. The average person likely associates the Mozilla Foundation with its browser, Mozilla Firefox.

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