Ok I had to Google this because I've never seen anything on squid intelligence. Octopus and cuttlefish, yes. Looks like squid got more going on than I'd previously thought.
I still need some convincing on decapods though.
Also, do you like own Lemmy or something? You're EVERYWHERE.
Dunno about legal, but I'm pretty sure the scientific bar for sentience is pretty low. You basically just have to have senses (e g. hearing, sight, etc) and react to stimuli to be sentient.