I'm missing something. Why does one need to copy the Turbo Tax CD? When installed on your system, the CD is not used.
I think the main issues with C-Dilla are:
I can't find much on the first two claims, but it appears that C-Dilla does install a bunch of stuff and keys and does not un-install with the app which installed it to begin with.
You actually are allowed, legally, to make a backup copy of any program you buy. You are not allowed to distribute it, obviously, but you are allowed a backup copy. I don't think the DMCA changed that, but I could be wrong.
While it doesn't happen often, CD-ROMs do occasionally become unreadable and it's nice to have a backup for peace of mind, especially since you ususally only find out the CD is bad at the worst time -- like when you are doing a compete reinstall of your system and you need mission-critical software back up and running yesterday.
The problem people have with C-Dilla is not the concept of a vendor trying to prevent theft, it's with the notion that, unknown to the user, invasive, intrusive, and potentially desctructive software is being installed on their machines without their knowledge.
It's a bit like finding out that because you purchased a book at Barnes and Noble, you unknowingly gave the major publishing houses consent to enter your home while you are at work and rummage through your stuff to make sure you aren't Xeroxing their copyrighted materials. Some might say, "Well, if you aren't doing anything wrong, you have nothing to hide." Others will just say, "Get the hell out of my house before you eat the end of a .45."