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#1
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Is decryption/compression still needed to copy a DVD movie using a dual-layer burner?
Correct me if I'm wrong here.
Once upon a time, consumer DVD burners were limited to burning single-layer DVD's with a capacity of around 5 gb per disk. But (all?) commercial movie DVD's come on dual-layer disks with a capacity of up to 9 gb. So it was never possible for the home computer user to make an exact copy of a DVD movie in a manner similar to making an exact copy of a music CD. Instead, the movie had to be decoded (de-crypted) and then re-compressed (with arguably some loss of detail or resolution) in order to fit onto a 5 gb blank media. But with the copywrite or patent or licensing issues surrounding the decoding/decryption process, there really was no "legal" source for the decoding software (DVD X-copy being an exception that was eventually killed by the courts). There are, however, public sources for free-ware decryption and compression software. Now then, with the availability of dual-layer DVD burners and dual-layer media, it should therefore be possible to make a straight copy of the files on a movie DVD and burn them onto a blank dual-layer DVD disk and end up with a copy of the movie without the need to seek out and use decryption/re-compression software. Is there something I'm missing here, like perhaps some other form of copy protection or hidden files on the movie DVD that can't be simply copied to the burn-able disk? |
#2
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#3
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#4
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DVDDecryptor will make an ISO and burn it to a DL disc very nicely, placing
the layer break in the same place as well. "Joe" wrote in message om... Correct me if I'm wrong here. Once upon a time, consumer DVD burners were limited to burning single-layer DVD's with a capacity of around 5 gb per disk. But (all?) commercial movie DVD's come on dual-layer disks with a capacity of up to 9 gb. So it was never possible for the home computer user to make an exact copy of a DVD movie in a manner similar to making an exact copy of a music CD. Instead, the movie had to be decoded (de-crypted) and then re-compressed (with arguably some loss of detail or resolution) in order to fit onto a 5 gb blank media. But with the copywrite or patent or licensing issues surrounding the decoding/decryption process, there really was no "legal" source for the decoding software (DVD X-copy being an exception that was eventually killed by the courts). There are, however, public sources for free-ware decryption and compression software. Now then, with the availability of dual-layer DVD burners and dual-layer media, it should therefore be possible to make a straight copy of the files on a movie DVD and burn them onto a blank dual-layer DVD disk and end up with a copy of the movie without the need to seek out and use decryption/re-compression software. Is there something I'm missing here, like perhaps some other form of copy protection or hidden files on the movie DVD that can't be simply copied to the burn-able disk? |
#5
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" wrote in
: Id like to see a site comparing a slightly compressed version to the original , This is one for a long film ... http://www.dvd.box.sk/articles8.php http://www.dvd.box.sk/articles12.php -- Lordy |
#6
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right now a blank dual layer disc costs up to $15 each...whats the point?
If your going to spend $15 for the disc, why not just buy the original? "Dan G" wrote in message ... DVDDecryptor will make an ISO and burn it to a DL disc very nicely, placing the layer break in the same place as well. "Joe" wrote in message om... Correct me if I'm wrong here. Once upon a time, consumer DVD burners were limited to burning single-layer DVD's with a capacity of around 5 gb per disk. But (all?) commercial movie DVD's come on dual-layer disks with a capacity of up to 9 gb. So it was never possible for the home computer user to make an exact copy of a DVD movie in a manner similar to making an exact copy of a music CD. Instead, the movie had to be decoded (de-crypted) and then re-compressed (with arguably some loss of detail or resolution) in order to fit onto a 5 gb blank media. But with the copywrite or patent or licensing issues surrounding the decoding/decryption process, there really was no "legal" source for the decoding software (DVD X-copy being an exception that was eventually killed by the courts). There are, however, public sources for free-ware decryption and compression software. Now then, with the availability of dual-layer DVD burners and dual-layer media, it should therefore be possible to make a straight copy of the files on a movie DVD and burn them onto a blank dual-layer DVD disk and end up with a copy of the movie without the need to seek out and use decryption/re-compression software. Is there something I'm missing here, like perhaps some other form of copy protection or hidden files on the movie DVD that can't be simply copied to the burn-able disk? |
#7
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In article Pt4rd.210108$df2.72@edtnps89, Jamco wrote:
right now a blank dual layer disc costs up to $15 each...whats the point? If your going to spend $15 for the disc, why not just buy the original? Last month I saw them priced at about $10 each. Two days ago the same place had them at $9 each. They are getting cheaper but at about 40 cents for quality disks [if you know where too look and follow sales] makes them far cheaper. "Dan G" wrote in message ... DVDDecryptor will make an ISO and burn it to a DL disc very nicely, placing the layer break in the same place as well. "Joe" wrote in message om... Correct me if I'm wrong here. Once upon a time, consumer DVD burners were limited to burning single-layer DVD's with a capacity of around 5 gb per disk. But (all?) commercial movie DVD's come on dual-layer disks with a capacity of up to 9 gb. So it was never possible for the home computer user to make an exact copy of a DVD movie in a manner similar to making an exact copy of a music CD. Instead, the movie had to be decoded (de-crypted) and then re-compressed (with arguably some loss of detail or resolution) in order to fit onto a 5 gb blank media. But with the copywrite or patent or licensing issues surrounding the decoding/decryption process, there really was no "legal" source for the decoding software (DVD X-copy being an exception that was eventually killed by the courts). There are, however, public sources for free-ware decryption and compression software. Now then, with the availability of dual-layer DVD burners and dual-layer media, it should therefore be possible to make a straight copy of the files on a movie DVD and burn them onto a blank dual-layer DVD disk and end up with a copy of the movie without the need to seek out and use decryption/re-compression software. Is there something I'm missing here, like perhaps some other form of copy protection or hidden files on the movie DVD that can't be simply copied to the burn-able disk? -- Bill Vermillion - bv @ wjv . com |
#8
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MCheu wrote in message
No compression, but you still need decryption. The region of the disc where the encryption key is stored on a pressed disc isn't writeable on a writeable disc. So what you're saying is that even though I can replicate all of the files on a movie CD by doing a straight copy to a blank dual-layer disk, there is still something on the movie CD that can't be copied or replicated on the destination disk. That something being an attribute or some other element of data such as an "encryption key" (that is not stored as file itself?). If so, then the process of decryption is still needed only to generate a non-encrypted version that can then be burned to a dual-layer disk (yes?). Does that also mean that I can't burn an encrypted version of my own home movies to a DVD? (in other words you can't create your own DVD with the same copy-proof "strength" as a commercial movie CD). ? it is IMPOSSIBLE to write to that region on a writeable disc. That's by design, and even if you can get around that in the burners, there's still the matter of the discs themselves. In other words, you're saying that a blank DVD disk is not necessarily blank, but that it will always retain some information that can't be altered or over-written by a DVD burner drive, and that's why you can't simply dump the contents of a commercial movie DVD over to a blank dual-layer disk and expect a DVD player to play it. Does that also mean that I can't copy the contents of a commercial movie DVD to my hard drive and play it from the hard drive as-is ? |
#9
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#10
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I wonder ...
The un-writable portion of an encrypted movie DVD (the part that contains the encryption keys) is readable, right? If so, can that data be read by the host computer? If so, then ... question: does the decryption in a standard set-top player (or PC-based DVD player software) perform the decryption in the host computer? If both of those questions are YES ... then one could produce a DVD copy without doing any decryption! Instead, you could copy the data (vob, ifo, etc.) files directly to another DVD, as a standard ISO or UDF file system. Now, suppose you were to develop special software that wrote that DVD ISO/UDF file system in a "special" way. Instead of creating a 4.500 GB file system, create one that's only, say, 4.499 GB. Leave the last 1 MB of storage untouched by the file system. Copy the entire set of original DVD files to this perfectly-normal 4.499 GB file system. Then, copy the encryption codes from the original DVD into that last, reserved MB of space. Now, develop special software (a special DVD player program) that reads the encryption information from that last MB, and reads the vob files as usual from the standard file system. Perform the decryption of the vob files using the (perfectly correct) encryption keys that you read from that last MB. All of this assumes that: 1. The encryption keys are readable by the host computer. 2. The encryption takes place on the host, not in the DVD drive. 3. You have the gumption to write special DVD burner software that will create the special file system with the "extra/unused" MB. 4. You have the will to write a special DVD player program to recognize the specially-formatted DVD. Of course, this applies to PC-based playback only ... unless you know how to hack the O/S of a set-top player. And, of course, I wonder if all of this produces a real benefit. We already have the means to crack the encryption. I just wonder ... If my idea, above, could be made to work, then would the time needed to do make a copy using this copy-unencrypted-and-burn method be faster than the existing copy-decrypt-and-burn method? "MCheu" wrote in message ... On 1 Dec 2004 18:01:00 -0800, (Joe) wrote: |
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