I have Sonar installed on 3 current computers, but only use one at a time, which you explicitly agree to follow as a required part of the installation process.
While they do not at the moment seem intent on cracking down on multiple instances of the same product license being up and active, it WOULD be a violation of the licensing terms to have Sonar actively in use on more than a single computer at the same time.
Many users APPLAUD Cakewalk relying on the general honesty of its users, and if you have had to deal with iLOK and all of that crap, you would understand why folks are very happy Cakewalk does things as it does with regard to licensing.
Bob Bone