Yep. Just think of it like this.... if you build a 4ft tall castle with popsicle sticks, whose castle is it?

It's yours. You made it. You don't have to put a sign on the castle in your yard saying "Don't use without permission". It's *yours*. Taken as granted.

Now, if someone steals it, you might have to prove you own it to get it back, which is why people get insurance, or in the case of intellectual property, they take out patents and copyrights and things. But even if they don't, it's still theirs until they say anyone can have it