Just noticed this:
https://bitcointalk.org/index.php?topic=353688.0.
While you mine, say, LTC, you simultaneously produce USC with exact same hashes (?). Does it mean, if you own USCs, you can steal LTCs with exact same hashes? Or do I understand the whole *coin protocol wrong?
I heard this is the same with Namecoin, if you mine a single Bitcoin, you also get a Namecoin for free.
How does it work? I don't know. Someone please explain.