Free software activists shouldn't sue people right from the start, they should instead enforce it through collaboration, first by private communication with the violator, then after series of negligencies done by the violators, the original project can express their disappointment publicly, then wait for the violators to apologize and accept the suggestions or collaborations done, and only after series of negligencies, it must be thought on suing the violator. This might take years, but the most immediate advice you can deliver to a possible violator is to cease redistribution temporarily until the issue is resolved or proven to be false by all the parties involved.
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