I could not find the info you indicated at that site but I've been hearing it for years from armchair lawyers.
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You can start here
http://mtu.com/support/copyright-notes.htm of course this is a legal
opinion and doesn't mean anything until there is a court case and a judge rules one way or another.
My personal opinion (for what it's worth) is that because the use of this technology for karaoke and DJ is so pervasive that a judge would be hard pressed to rule it illegal without some kind of loophole (such as the requirement of having the originals available for inspection). But again this is MY opinion.
Sam