... and by Dumb, I mean really Dumb Question. I am starting to sell my productions. They are being used in both my shows and other local theater productions; ads on radio and online. I am using Producer and I am building off of loops provided in the libraries. IOW, I am using the loops as starting off points and I am also combining various loops. 
 
Can I do this? Use the loops in Sonar library, add to them, arrange them, mix them and sell the final products? 

There are no dumb questions, only dumb questioners. 
 
I am pretty sure the loops are provided for just such a purpose, so probably licensed for that use as well. Find and read the license\terms of use that came with your version of Sonar and see if there are any restrictions on what you plan to use. I seem to recall that there were restrictions on some of the sample content at least in the past.

yep.  you can do that.

Beagle
yep.  you can do that.

But can I?

bapu

Beagle
yep.  you can do that.

But can I?

nope.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
you stink at loops...

bapu

Beagle
yep.  you can do that.

But can I?

Uhhhmmm Hellooooooooooo.........you've already done that.........many times........
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
........looped in the FSF.

Beagle

bapu

Beagle
yep.  you can do that.

But can I?

nope.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
you stink at loops...

I no

Beagle

bapu

Beagle
yep.  you can do that.

But can I?

nope.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
you stink at loops...

I no

Beagle

bapu

Beagle
yep.  you can do that.

But can I?

nope.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
you stink at loops...

I no

Beagle

bapu

Beagle
yep.  you can do that.

But can I?

nope.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
you stink at loops...

I no