Here is a topic which hasn't been discussed in depth so far:
"Most lawyers still do not understand the science of SETI and why the law should engage with it. In turn, SETI scientists may have, at best, only a glancing knowledge of the legal issues around SETI; that is even more true regarding the issues that may arise from direct contact.
There is a need to reach a baseline of mutual understanding about the issues that will need to be determined in the event of contact. This can include extremely speculative hypotheses surrounding hostile contact on the one hand and the accession to a network of civilizations, or “Galactic Club,” on the other. These may test fundamental human ethical and legal values in the areas of the law of armed conflict and human rights law."
Will it be allowed to contact ETs in the future? Or will it be forbidden? A bad first contact - in the worst case - might even trigger an invasion...
It's certainly an interesting topic, and one that does need to be explored.
However, there's a huge aspect that somewhat makes anything decided or discussed here rather meaningless - what if the ETs have zero respect for our laws? (in much the same way as the colonial forces didn't give two hoots about the laws and customs of the peoples they invaded)