I don't understand the point of CC being a thing on the gallery for Sims and lots...

On this note, I've noticed that the gallery will claim "CC" was used when you do things like use created in-game paintings, etc. on the walls of a lot. I'm pretty sure it marked them as "CC" when it was simply paintings, and not custom still-shot "paintings". Possibly anything that has a sim-name tagged to it as the "creator" of said object? I personally found this annoying. BUT, as mentioned above, tons of people upload lots and families to the gallery as a backup for themselves and not so much for other's use.