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The GPLv2 goes to court

The General Public License Version 2 (GPLv2) continues to be the most widely used and most important license for free and open source software.

Black Duck Software estimates that 16 billion lines of code are licensed under GPLv2. Despite its importance, the GPLv2 has been the subject of very few court decisions, and virtually all of the most important terms of the GPLv2 have not been interpreted by courts.