Licenses are PITA to deal with regardless of how much you're being paid.

Especially on servers, and especially if for some stupid reason licensed software need internet access to confirm it is licensed, coz that's extra crap that needs to be added on proxy or firewalls and will inevitably break when they change something.

If it's "hey, pay us X and we trust you don't cheat us" yeah, it's just extra invoice ,whatever.