DVD to DVD?

[birdgod]

Any one know how can i make copys of DVD movies? I have a DVD-RW drive i would like to make backups of my DVD movies and keep all the features. Can that be done? If anyone know any sites that provides these info please tell me thanks.

Birdgod

[Kdiddy]

See all recent topics here, put your reading glasses on.

http://rilanparty.com/vbb/forumdisplay.php?s=&forumid=39

In short, a byte for byte straight copy CAN NOT be done purely because of physical encryption place on DVD-R media and not to mention most DVD movies these days are bigger that 4.7 GB.

[Dave B]

I'm curious... what encryption does a DVD have which prevents a byte for byte copy? Surely this sort of copy would work regardless of if the data is encrypted or not?

[Kdiddy]

Well you didnt read many of threads on that link huh?......if you need the link to where this info was gathered, let me know, and I see if I can find it again.


"When authoring isn’t authoring:

There’s an important point here that isn’t immediately apparent. There’s a fundamental distinction between a “DVD for General” device and a “DVD for Authoring” device – terms that are admittedly a bit misleading, because you might reasonably assume that “authoring” and “burning” a DVD are the same thing. But they’re not. According to a white paper on DVD-R from Pioneer (the company behind the SuperDrive), the two types of DVD-R media use different recording laser wavelengths: “DVD-R for Authoring” requires 635nm wavelength recording sensitivity, while “DVD-R for General” uses 650nm wavelength recording sensitivity. That’s why they need different devices to write to them. (This is, however, not an issue for playback, only for recording. Any playback device that supports DVD-R should play either type of media – but more on this in a moment.)
“Why are there two formats?” the white paper asks. "The key reason for the introduction of DVD-R for General media is that it contains content protection measures that make it physically impossible to make bit-for-bit copies of CSS encrypted entertainment titles.”In other words, you cannot make a pirate copy of a movie, for instance, straight from a commercial DVD encrypted with CSS (Content Scrambling System), one of the two encryption systems in general use. (You can of course play movie DVDs encrypted with either CSS or the other widely used system, Macrovision.)

Master of your own fate:
That’s fair enough, you might think: after all, the point isn’t to make life easy for pirates. However, you can’t add such copy-protection to DVDs that you create yourself either.
This is a limitation of DVD-R as a whole, not just the DVD-R for General format: according to the Pioneer white paper, neither DVD-R(g) nor DVD-R(a) media can store CSS encrypted video content. In fact such encryption is added at the DVD mastering stage by commercial replicators.


<font size=-1>[ This Message was edited by: Kdiddy on 2001-12-07 03:41:19 ]</font>

[Dave B]

What is this physical limitation which stops DVD burners (authoring/general/whatever) from writing CSS keys - all the documents which have been linked to are a bit sketchey about the reasons.

Is it that the burners can't write to a particular area on the DVD or are they programmed to recognise a CSS Key and not author it (like those photocopiers from the 90s which wouldn't copy a bank note..!)

Obviously, I'd normally search for this information but Doom9s search facility seems to be down.

[Kdiddy]

Yes that is exactly it. Just a CDRW writer does on CD, A DVD writer uses certain areas of the disk for what is called lead-in & lead out tracks...in the case of DVD professionally authored material, there is an dedicated physical sector/track that contains what is called the Disc/Data Description Protocol, where the the decrypting keys for the movie files are stored...well not only have DVD burners been program in their firmware not to write to this area, which why you can't copy protect any of your own home movie videos...but DVD-R(g) does not physically contain that extra sector/track needed.