Originally posted by Alejandro Nova
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But the answer is: The FSF copyright assignment form has a clause that guarantees all future versions and other derived works will be released as free software (parallel nonfree versions are allowed). Thus even though FSF becomes the sole copyright holder they do not get the right to lock up future versions.
Most other copyright assignment forms, like Canonical's, do not contain that clause, because locking it up (or having the power to) is their goal. FSF's goal is to be able to defend GPL rights in court, because there is/was a rather obscure doctrine in the courts that one of many copyright holders does not have the right to bring lawsuits in the same way that a sole copyright holder would. Thus FSF wanted to hold sole copyright on Gnu code to make sure courts recognized them as having legitimate standing to assert GPL rights. That legal doctrine has been weakened by some more recent court rulings but Gnu still uses assignment on some projects out of inertia and as a precaution in case some courts still decide to follow it. Even though Gnu and Canonical's documents are both copyright assignments they're really polar opposites in spirit.
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