March 2025
Intermediate to advanced
470 pages
12h 45m
English
Well over a hundred FOSS licenses are out there in the world today, and generally they fall into one of two different buckets: reciprocal or permissive.
Historically, the first ever FOSS licenses were the reciprocal ones. Also often known as copyleft licenses (a play on the word copyright), reciprocal licenses are most frequently associated with the Free Software side of free and open source software because they place the Four Freedoms of Free Software—the freedoms to run, copy, study, and modify—front and center. In this book I’ll be using the terms reciprocal and copyleft interchangeably, with a preference for reciprocal, as it’s descriptive rather than merely clever.
Despite there ...
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