Check this link:

kb.altiris.com/article.asp

Patch doesn't release a license until you actually delete the computer from the NS; which is not recommended if you use asset. Your SWD licenses look like they are for MAC though?

 A long time ago I had a problem where the software delivery solution agent was not getting installed correctly on a LOT of computers. I noticed it the way you did, with a really low license count. I called Altiris support and they did something to fix the Software Delivery Solution agent install task and collection, but I can't remember what they did!

(for example) only consumes a license, once a machine has received software via a deployment (or pulled it down via an advertisement).

The agent roll-out tasks has some pretty bad issues, and I there was some fixes for that, if you are not at 6.1 SP3 of Software Delivery Solution.

One thing you may not know is that if you are not using Software Portal or Sequential tasks, you don't need the SWD Agent or the Task Sync agent. The software delivery .dll is built into the core agent.