I am putting bootable programs/files on CD & DVD; and was wondering how to copy-protect them, preventing anyone from copying it to a CD or DVD, or from copying it to their computer I have Nero, but I don't think they have any copy-protection options
A usual cd-burning device can't do that. Copy-protected discs are in most cases made with machines, and not with a cd burner.
Even the "industry standard" copy protections still fall easily, so trying to do it is a bit pointless.