I cant clone already Selfbootable games!WHY?

Ok i have this problem in my mind and it looks that i cant get it out...
The games that run with the Utopia Boot disc can be cloned very easily by burning them with Nero Burning run or other burning software.
*BUT*
What its going on with the selfboots.I tried many times to burn by using a lot and different settings each time but none game could run on my Dreamcast.
What the heck its going on with the Selfboots comercial games.Why i cant clone them just as they are?
Pleaseeeeeeee help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Have you read the rules?

If not - do so now!

If you have - you should know better!