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Line 41: \|title=GNU General Public License version 2 }}</ref> The <ref>{{cite web\|url=https://www.gnu.org/licenses/old-licenses/gpl-2.0.html\|title=GNU General Public License version 2}}</ref> of 1991 says that patents convert free software to proprietary: "''Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all.''" ==The 2004 OSRM study==

Software patents and free software: Difference between revisions