I don’t think it’s a copyright violation – first off, I don’t think there’s a copyright on it. Second, even if it does have a copyright on it, quoting the lyrics for the purpose of this thread should fall under fair use.
Copyright is automatic–you don’t need to affirmatively claim it or register it. Quoting something in its entirety is much less likely to be fair use, and I’m not expert enough to know how to apply fair use. So we’ll just stay away from copyrighted materials.