Rysiekúr (old account)@Shamar @kaniini if the copyright system made it possible to ban clean room reimplementations, you would not have a lot of the GNU utils, which are cleanroom reimplementations of closed-source tools from different UNIXes.
Patent laws are being used for this exact purpose these days. That's why they're considered evil by the FLOSS community.
Be careful what you wish for.
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