Needs a new edition but comprehensive enough for GPLv2: https://www.oreilly.com/library/view/understanding-open-source/0596005814/ch03.html https://www.oreilly.

Needs a new edition but comprehensive enough for GPLv2: https://www.oreilly.com/library/view/understanding-open-source/0596005814/ch03.html https://www.oreilly.com/library/view/understanding-open-sour...