Please have a read of this link...
http://www.dieselarmy.com/news/gm-te...-not-touch-it/

Chad (the author of the article) has pretty much covered every point why this is dumb, of course the big point missed by the suit and tie guys at GM is would you buy a GM car (or any manufacturer for that matter) that makes it a breach of copyright to tune it? Would sure make the local drag strip look funny when 20 Camaro's line up all running the exact same times.
I 100% agree with their 'software' being protected, if GM's spark controls contain code that is better than any other manufacturer (including aftermarket ECM's) then they have every right to stop that being copied, I'm just not sure how you copyright table values.

I decided to make this into a poll, pretty sure I know the outcome already.