my license says,
"If you have paid the license fee for a single user license, this Agreement permits you to use one copy of the Software on any single computer, provided that the Software is in use on only one computer at any time. If you have paid the license fees for multiple licenses of the Software, then at any time you may have as many copies of the Software in use as you have licenses. The Software is "in use" on a computer when it is loaded into the temporary memory (i.e. RAM). If the potential number of users of the Software exceeds the number of licenses you have purchased, then you must have a reasonable mechanism or process in place to assure that the number of computers on which the Software is running concurrently does not exceed the number of licenses purchased. "
I's pretty clear, as long as only one instance of that license is open at any given time, it can be on several computers.