Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site clyde.UUCP Path: utzoo!watmath!clyde!saf From: saf@clyde.UUCP (Steve Falco) Newsgroups: net.audio Subject: Re: Copy protected records? Message-ID: <798@clyde.UUCP> Date: Mon, 11-Feb-85 13:32:09 EST Article-I.D.: clyde.798 Posted: Mon Feb 11 13:32:09 1985 Date-Received: Tue, 12-Feb-85 04:55:56 EST References: <305@boulder.UUCP> Distribution: net Organization: AT&T Bell Laboratories, Whippany NJ Lines: 18 > I have heard rumors from a couple of sources now that some record > companies are adding a high frequency signal to their records that > interfere with the bias on tape decks, thus making it difficult to make > tapes of said records. Does anybody know if this is really true, and > if so, just what the technique is? In the first place, this will cause all kinds of noise and modulation problems in a lot of equipment (not to mention blown treeters) so I doubt any company is dumb enough to try it. Also, any tape-deck that is even slightly respectable has a filter to remove the stereo pilot when recording from FM radio. The filter would presumably be able to handle a deliberate "copy protection" signal as well. Fear not! Steve Falco AT&T Bell Laboratories