Path: utzoo!mnetor!uunet!husc6!bloom-beacon!mit-eddie!ll-xn!ames!pasteur!ucbvax!ulysses!smb
From: smb@ulysses.homer.nj.att.com (Steven Bellovin)
Newsgroups: sci.crypt
Subject: Re: Scrambling of Pay TV channels
Message-ID: <10270@ulysses.homer.nj.att.com>
Date: 2 May 88 17:53:19 GMT
References: <735@trwspf.TRW.COM> <7820004@hpcupt1.HP.COM> <5028@bloom-beacon.MIT.EDU>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 6

}Does anyone know what types of schemes are used to scramble pay TV?  Are there
}different schemes depending on whether transmission is for cable-TV or for
}microwave transmission?

Some cable companies don't scramble at all; instead, they use a notch filter
on the pole to block the signal entirely.