lock up contents of dvd using a range of serials

Posted on 2009-12-17
Last Modified: 2013-12-13
We create dvds of vector graphics and I need to lock these contents down with a serial like functionality.

The reason I say like a serial and not just a simple passphrase like zip password protection is that I need each customer to have a different password.

is there any software out there that anyone knows about that would do this?

Question by:mors3
    LVL 33

    Accepted Solution

    it's possible, but the issue you are going to have is that once you have unlocked it, the vector graphics will be able to be copied from your media to unencrypted media - so you are going to get little benefit from the very small "road bump" you have put in their path.

    locked media really only work if you can also control the accessing application, so it can unlock "on the fly" individual records and make it awkward to bulk copy records from the system. you might get away with that if you have a previewer that lets you "browse" the contents and copy just a single graphic to local storage for use. its merely a bigger roadbump, but is likely to have a better effect (and with a bit of effort, you may be able to get it to "label" the extracted graphics with the serial; depends on the format of course, as you want the information to be visible in the headers when you find pirated content online, but not visible as graphic data and thus degrading the image).

    the other issue of course is that the media on disk will need to have a fixed key (unless you wish to custom-build each disk) so unless you are distributing a keyfile rather than a literal serial, that key is going to be visible at some point in the process. A common solution to THAT issue is to calculate something machine-specific, have an activation process that gives the machine key and serial to a website and returns a third key that, when XORed to the first two, gives the actual key to decrypt the data (possibly more than one if you have more than one product set on the same media)

    Author Closing Comment

    perfect, thanks.

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