Nemo dat quod non habet

Imagine you have a toy that you really love and someone comes along and takes it from you without asking. That's not fair, right? Well, the same idea applies to things that people buy or sell.

"Nemo dat quod non habet" is a Latin phrase that means "no one can give what they do not have." It's a legal principle that basically says if someone doesn't actually own something, they can't sell it or give it away to someone else.

So, just like you wouldn't want someone to take your toy without asking, it wouldn't be fair for someone to sell or give something they don't actually own to someone else. It's important for everyone to make sure they really own something before they try to sell or give it away.