Modifying the content of VCD already burned on a CD-RW

[hooklee]

Hello,

I would like to protect my video CDs from unauthorized access, so I had an idea but I don´t know if there is any available software that allow me to do that. The only requisite to this solution is a computer with a CD-RW writer drive. First step would be to save the video CD on a CD-RW, after that would be to use a software to modify some data on the CD (maybe to scramble the TOC). If anyone try to play the disk an error would occur because important information to the correct playing of the CD was modified. If want to play the CD, I would have to put the CD-RW on the computer and use the same program to descramble the CD (reverse the previous modification) and finally play the video CD. Can anyone help me with this?

Thanks!

HookLee

[tweedledee]

This is a link to severall free programs that will encrypt your files, you can then burn them to cd and later load back on to your computer for de-cryption. I don't know if this is what you mean.

http://www.webattack.com/freeware/security/fwencrypt.shtml

[vitualis]

You cannot modify a S/VCD once it has been written to a CD-RW (except for blanking it completely of course).

Regards.

[hooklee]

You cannot modify a S/VCD once it has been written to a CD-RW (except for blanking it completely of course).

Regards.

Thanks for the comment, but I actually disagree with your affirmation because since the media is RW (rewritable) theoretically it means that you can clear and rewrite information on it, maybe the Writing programs like EZ CD and nero don't have the option of doing what I'm proposing, but at least in theory, it's possible. I think that probably doesn´t exists any program to do this, it is just what I'm trying to find out, but maybe a smart programmer can study the API relationed with the subject and make a little application to do this. The main idea is to protect the material with the less time to encrypt/decrypt, that's why I thought in changing only few bytes of the CD. If I had to encrypt and save, or copy to HD, decrypt and resave, ... It will spent too much time. If anyone else has any other knowledge how to do this, it would be great!

[vitualis]

You cannot modify a S/VCD once it has been written to a CD-RW (except for blanking it completely of course).

Regards.

Thanks for the comment, but I actually disagree with your affirmation because since the media is RW (rewritable) theoretically it means that you can clear and rewrite information on it, maybe the Writing programs like EZ CD and nero don't have the option of doing what I'm proposing, but at least in theory, it's possible. I think that probably doesn´t exists any program to do this, it is just what I'm trying to find out, but maybe a smart programmer can study the API relationed with the subject and make a little application to do this. The main idea is to protect the material with the less time to encrypt/decrypt, that's why I thought in changing only few bytes of the CD. If I had to encrypt and save, or copy to HD, decrypt and resave, ... It will spent too much time. If anyone else has any other knowledge how to do this, it would be great!

Perhaps it is theoretically possible but there are no tools in existence that can do it... Anyone who even knows how to begin, I'll be interested to know.

Regards.

[antonv]

If you want to burn a normal Video CD that will play in DVD player, You have to use "close cd" option in any encoder. Otherwise, it will be impossible to play it as VCD. After using "Close cd" you can not use anything with even CD-RW (except erase it) because it closes the cd for any further burning processes. API functions exist for the processes allowed by hardware. If you CD-Burner does not allow the burning (in this case to closed CD-RW because it can lead to damage to cd), you can not make cd-burner do it until you will write your own drivers (If this allowance is controlled by hardware drivers).
Conclusion: you can not make any changes to a normal standard compliant Video CD on CD-RW until it is fully erased.