Development of Creative Commons licenses

["Carl Camera" <carl AT vinebranches.com>]

Hello,

Hey I've got a blog engine and website content management 
system that I'd like to give away to folks for their 
personal use.  My product is not distributed as source 
code -- it is distributed as an executable file (DLL) and 
other user-alterable files such as configuration file, 
style sheets, and content files.

CC by-nc-sa 2.5 seems perfect. It appears that this 
license will let folks...

DO THIS:

* alter default sytlesheets
* alter default template files
* alter default configuration files
* add images
* add content
* create and manage a website for themselves or others for 
non-commercial use

BUT NOT DO THIS:

* create a website for a client then charge them for it

My two questions:

(1) Could folks comment on my current understanding of 
said license terms?
(2) Can I exempt the DLL from the license?  Meaning, I do 
not want my product's DLL altered (because then, well, 
it's really not my product is it?) If I need an exemption, 
what would it look like?

Thanks for any insight you can provide.