Lucasfilm and Disney are the two mist litigious film companies out there. Lucas regularly issued C&Ds to garage kit manufacturers I know who dared to make unlicensed short-run resin amateur model kits, and Disney once sued a daycare
for painting Disney characters on a playground wall.
As for Han shooting first - holy poop, he'd have been the stupidest guy in the galaxy NOT to! Greedo's last line CLEARLY indicated he was about to shoot Han! Somebody's holding a gun in your face and says something that indicates he's about to shoot you, you do NOT wait for him to shoot first! You shoot the fucker, or you fucking DIE! It counts as self-defense, believe me!