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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