Date: Sun, 17 Mar 2002 07:53:16 From: "neil barnes" <[EMAIL PROTECTED]> Subject: Re: making MP3s to fill my new HDD [LIB]
>Date: Sun, 17 Mar 2002 06:13:05 +0000 >From: "Matthew Hanson" <[EMAIL PROTECTED]> >Subject: Re: making MP3s to fill my new HDD [LIB] > >(Caution: Absolutely no Libretto content here... ) >>There will ALWAYS be a way of copying the audio. After all, if you wanted >>to push it to the extreme, you could always play the CD in a half-decent >>CD >>player, plug the digital out (or analogue out if they've protected digital >>signals) into another device or a computer then just record. No way they >>can stop that ... < You will always be able to read a digital data stream...after all, if you can't decode it, you can't play it, so what's the point. However, the sp-dif domestic format includes a copy inhibit bit which recording equipment is *supposed* to respect. I suppose the US govt will require that unstreaming chips *must* obey, but it won't make any difference - professional systems always ignore the copy bit. > >Heh... yeah... that was the very first thing I thought when I read that >article... No stoppin' tappin' into that digital stream with a fancy lure! > >>schemes like the Anti-VCR stuff on DVDs won't fix that for instance >>because >>there is no intelligence in the recorder that can be 'fooled' that can't >>be >>'turned off'.< > >I had a fairly knowledgeable friend who works with videocassettes tell me >that some new (in the past many years) VCRs (don't know about DVD players) >ARE in fact made with copy protection that is written into SOME >videocassettes ... and so keep them from being copied. Know anything >about this Raymond? > Again, there are various mechanisms to upset video recorders. The simplest is to put a varying height pulse in the frame blanking pulse - on record, most domestic vcrs do an automatic gain control based on the height of the sync pulse in blanking - so the brightness of the rest of the frame is incorrect. Doesn't stop it being recorded, but makes it unwatchable. Of course, a video signal processor will chop that straight out again... You could use the same mechanism on a DVD to make it unwatchable on tape, though the easiest way of implementing it would be to drive the output chips directly depending on the copy bits. _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://libretto.basiclink.com/archive - Archives http://www.picante.com/~gtaylor/portable/faq.html - FAQ -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
