Designers: What do you do when you find a forum that removed your copyright?

[Audentio]

I know that the MyBB team has the right to take legal action, but what about something much smaller such as a skin or something.

I've been to boards where my skin is there and my copyright has been completely removed. Its like scraping off the signature on a painting. And no, I mean that a bit lighter, but even still.

What does the MyBB Team think? Other designers? Members who use the services? Tell me what you think, I don't know what I have the right to do or if I should just accept it as something I can't help.