Originally Posted by Arrowmaster
it's my opinion that most seem to rather lax on caring if somebody directly copy and pastes a small block of code.
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Which would actually be counter to your ARR argument. However, there also may be behind-the-scenes discussions between authors that the public never sees and is never documented. While on the surface it may look like "theft", there may be a verbal agreement.
Ultimately, I just do not think licensing is preventing addon development. I think the secure code probably intimidates more people than anything else and you cannot make unit frames without a good foundation in understanding the secure code.
Also, I should note that you mention X-Perl, which itself was an offshoot of the old Perl unit frames. So there really is no reason that someone could make Z-Perl and not even wander into ARR territory. Save for the name itself, perhaps.