Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Editing › Block the Dvd’s from duplicating
October 18, 2006 at 7:26 AM #36895
October 18, 2006 at 8:42 AM #163825
Try using the search feature for more details, as this has been brought up many a time. But the short answer is no. There is no useful way to copy protect unless you are having the DVDs replicated instead of burned at home (and even then, it’s still quite simple to copy a dvd).
October 18, 2006 at 11:49 AM #163826
There is another feature like this that does not involve scratching the disk. But is does involve knowing how the VOB files are formatted. Much like it is decribed above you can make a black part of the video, which is a part that is never played by the dvd player, so your intro chapter is set after the black video. then you can supposedly edit the VOB file so that the parity bits (error checking codes) do not match the intended information. So when someone tries to Rip the DVD they will get a Cyclic Redundancy Check:
This should in theory do the same thing as scratching the disk, but you will not have to make guesses and it will be uniform to all disks that are burned. Now I have never done this myself. and I do not know the VOB format so as to how to do this or where the parity bits are located I have no idea. But I have seen it done of professional DVDs.
Mind you it is still possible to get around such hinderances, but it involves removing parts of the VOB file BEFORE ripping and some other things.
I can do more looking into this for you is you want me to.
October 18, 2006 at 1:37 PM #163827
I agree with you guys. That’s why I said "the short answer is no" lol. But yeah.
October 19, 2006 at 6:12 AM #163828
I would actually like to try getting around it. As far as I know is will be just as easy to rip. When I rip a DVD mind you this is in the toatally legal sense. I use dvdshrink. you can use a reauthor setting to set which part of video you wish to extract, so you can simply start the extraction after the black point. It shoudl work the same on the scratched dvd.
Anyway the reason I would suggest a are 3 fold. One it makes the peron buying such a dvd raise an eybrow when they get a brand new dvd with a scratch on it. Two if you accidentally scratch the wrong part you have ruined a dvd. Third, and in my opinion and extremly important one. If you are like me and are creating films, not wedding videos, then you would be most likely using DL DVDs and scratching the outside will cause the CRC exception, but it will also ruin the video after the layer change. All in all I think the digital means will do the same thing, but without the added probelms.
October 19, 2006 at 8:18 AM #163829
I agree completely. I’ve always told my clients that, although I own the right to use their footage for advertizing, etc., I don’t have a problem with them making copies themselves. I also give 10 copies as part of the normal package anyway.
October 19, 2006 at 11:56 AM #163830
I would also have to agree copy protection on such a small scale is pointless. The number of people with the compute know how to copy a dvd are very small and you have a low chance of getting them as clients. If you do get them there is absolutly nothing you can do to stop the copying. It would be a waste of time and energy to do so. Maybe when you become large buisiness it might be useful. another thing you could do is start using DL discs if you are not already. People cannot fit the DVD on their normal 4.7 GB discs, adn they will get confused, and they won’t even bother.
October 21, 2006 at 7:00 AM #163832jhumpirParticipant
Hi guys thanks soooo much for all this valuable information. Well a lot of my customers need copies and they want me to do it for like few bucks. But I like this point the more of my dvd’s out there it’s more advertisement for me.
One more thing if my finished dvd need any change like a song or a name change do I have to convert the vob files to dvd before make any changes.
thanks a lot
October 23, 2006 at 6:05 AM #163833
I am assuming you want to retroactively make changes to your video? Normally I would suggest that you make changes in your original project on your NLE, but if you no loger have that project do this:
This will be the easiest thing you have ever done right here
rename the .VOB file to a .mpg Now you can make the changes in your NLE, or if the changes will not alter the length of the vidoe you may, mind you this is only a maybe, save the changes to the mpg and then rename the mpeg as a .VOB
Hope this helps.
October 23, 2006 at 9:06 PM #163831emarchParticipant
The short answer is NO – there is no simple copy protection. With Linux or BSD or any OS that can read the device in raw format
it can read the disk image, so you get a copy of the sectors of data and no matter what byte pattern is on them you have them
all, and you can reverse the read and write the same byte pattern to the device and have a clone of the disk. As far as I know windows
do not allow RAW access to devices and interprets the data and file systems on the DVD’s where as the RAW mode does not.
The bottom line is charge for the work you can do and and dont worry about copies, Whenever I make customers DVD’s I usually
give them 3 copies using several different maufactures DVD’s, I had TDK problems – So now I use SONY, MEMOREX, and IMATION
and havent had problems (yet).
October 24, 2006 at 1:14 PM #163834hank-okvideoguyParticipant
While ThomasTyndan’s post regarding renaming of vobs to mpg will work, he failed to note that quality will suffer to the point of being useless – especialy where motion, panning, etc. is involved. The reason is that you are taking a compressed file and recompressing it – not a good idea.
If you’ll search these forums for similiar topics, you’ll find I’ve posted a program and method of doing this that works without loss of quality (I’m in Florida now and not where I can look up the program name). The caveat is that you can cut the file up and reuse any or all parts and stick new parts in, but you cannot re-edit any of the previously compressed file without the quality hit.
October 24, 2006 at 7:07 PM #163835
There shouldn’t be any quality loss. I am not talking about recompressing, I am talking about strictly renaming the file itself. so it were "example.VOB" then you would right click (on Windows) and choose rename and make it "example.MPG".. no recompression, no loss. Done!
There might be some audio stream issues, make usre there is ojnly one audio stream. but the video should be left in tact. The obvious problem with the method I posted above is that VOB are not strictly MPEG2s, but the video is strictly MPEG2, just not te audio, so one must be careful, the best thing to use to recompress and whatnot is probably Virtual Dub Mod.
Needless to say my method works without any quality loss.
October 25, 2006 at 9:47 PM #163836
I must be missing somehing… At what point are we talking about recompressing the video?… and for that matter, at what point did This thread get hijacked?!?!
But seriosly, lets say he had some rolling credits, now assuming that the credits are just a black screen with white text, he should be able to simply rename the VOB to MPG and then make the necessary edits, when he re-renders, he doesn’t have to change the bitrate at all. There would be no quality loss.
It might just be boggling my mind beacause I have the ever lovely Sony DVD-Architect, which only recompresses changed media… but I think my point should remain, there is no recompression, a VOB file IS an MPEG2 file. Now the compression of MPEG files are based on Bitrate, as long as the bitrate remains the same it would be as if you are doing a direct stream copy of the information for the majority of the video. Regardless, the point remains, always keep your project safely backed up, and ready for any last minute changes. As far as I know you can recompress as many times as you like and as long as you are not making changes to the bitrate you will not be getting any problems.
I dunno maybe I’m wrong, I’ll give it a rest.
October 26, 2006 at 6:38 AM #163837
Hmm I’m still confused actually… I just did a test, I took a VOB file, messed arouns ith adding clips etc. Rendered the video to a new file, using the same specs as the original… I amctually ended up with a smaller, file, becasue I lost some audio tracks, no surprise there… but the video quality remained the same. There was no difference, except for the changes I had made. I then took the new VOB file and placed it into the original DVD project and boom everything worked. The changes I had made were intact, no quality loss, and the only problem I can imaging coming up is the fact that I was missing audio info, but that can be fixed using VirtualDubMod. Anyway I am using the following tools:
Vegas 6, DVD Architect 3, VirtualDubMod (for adding back inoriginal audio streams) Maybe they just handle the information better. Or maybe we are at a misunderstanding as to the process we are talking about. In theory I should be able to do this with anything…
I KNOW this works because I have used it before so splice in random clips into a movie as a practical joke. If you want, when I have time. I will make a short demo that I will post, showing that this works.
October 26, 2006 at 11:50 AM #163838
Can you descirbe the artifacts?
January 4, 2007 at 2:13 PM #163839AnonymousInactive
Sell the copyrights to the production. It puts money in your pocket and gets more of your video out there. Don’t forget to advertise on your production. It can’t hurt.
January 22, 2007 at 8:04 AM #163840jNiceParticipant
Super info on the dvd copy protection question, but could someone please make things a little simpler if possible.
May 1, 2007 at 10:00 AM #163841AnonymousInactive
You know last year I did a video for a school, as a joke I put on the cover of the
dvd "not responsible for damage illegal attempts to copy this disk may produce. I had somebody call me and want to know how they could correct the computer because they had made copies and now their computer would not work. I told them it was a joke but they were still hacked at me. I thought it was funny.
April 11, 2008 at 11:35 PM #163842AnonymousGuest
Sorry to come to this htread late but I agree with those who advised that trying to control duping wasn’t worth the candle. We make our money on the main programmes, include five copies and sell any extras at little above cost. If people like the work enough to buy more they’ll get played.
April 12, 2008 at 1:52 AM #163843AnonymousInactive
The problem any so called “XYZ kids” will have undercutting you is not so muchin duplicating thecontent, but in creating adecent replication of the disc art. Videographers who create compelling disc art, (and who don’t skimp by printing on cheap standard-grade inkjet printable media), willpresent disc quality that can only be achieved by using the original artwork. So the results of any attempt to scan the original disc and reprint it will most likely be a disappointment to anyone who has seen the original set of discs.
I use Taiyo Yuden WaterShield Glossy DVD-R media exclusively for a look that impresses even the most discriminating of my clients. (Available at most online media dealers, including yours truly.
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