Uninstall patch mgmt for XP machines

First of all yes I know its bad we're still using XP machines but thats out of my control.  I'm wandering is it possible to not use a patch mgmt license for XP machines since they don't get patches anymore?  Its a waste of a licenses and I could use them for other machines.  I don't want to uninstall the Altiris agent, just not use the patch mgmt peice of it.  Is that possible?

Thanks!