This argument is incorrect, GPL doesn't restrict freedom, rather it creates an institutional framework to guarantee it. Just like the law itself, you have freedom in a liberal democracy only limited by the law, in this case you can use the argument that liberalism is contradictory because law restricts what an individual can do (killing others, robbery, frau, etc.). Without the law well be back into nature state (law of the strongest), BSD is insufficient for that because does not guarantee the same freedom in derivative works.
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This argument is incorrect, GPL doesn't restrict freedom, rather it creates an institutional framework to guarantee it. Just like the law itself, you have freedom in a liberal democracy only limited by the law, in this case you can use the argument that liberalism is contradictory because law restricts what an individual can do (killing others, robbery, frau, etc.). Without the law well be back into nature state (law of the strongest), BSD is insufficient for that because does not guarantee the same freedom in derivative works.