Running Unity Pro features and connecting to asset server without a Pro license

I've been told that its possible to integrate Unity into a build workflow without having a Pro license so long as you only use Unity from the command line. Is this true?

You can't (legally) have non-Pro users connecting to an Asset Server that Pro users work with, since the License specifies that everyone on a project has to have the same License level. I may have that terminology wrong, but basically, "A company, incorporated entity, or individual may not use both Unity and Unity Pro. So a team can't mix those two licenses.

Unity License