I'm doubtful about this "invention". It's Slovenia - my northern neighbour - so it's EU and there is no chance you can shoot anything - even the paint - on anyone unless you want a police visit and a court order.
Its not exactly legal here either
its a kickstarter so idk, it supposedly shoots tear gas as well. I'm going to assume it doesn't approve of the use (except paint), sell, or include either of those items and is therefore legal to sell...or they have permission for security purposes

but i'd wager on the former personally
A paintball isn't illegal enough to get arrested and it isn't considered a weapon for self defense, and the fucking guns I've seen can leave welts...so maybe it doesn't shoot them high pressure and they can chalk it off as marking them for police like it says...idk wtf with the tear gas--that is illegal

(and its what I'd use lmao)
EDIT:
Who am I kidding, I'd use a grenade launcher if I was allowed too
