The 3.9 betas use a 2-week trial mode now so you could use that without a license. Also, if you have your own account you log in with on those computers, you could carry a copy of the license file with you and install it on that computer as a Personal type license. You must be the only one who has access to the license on the computer/network for this to be within the
licensing terms though.
Let me know if you have any questions about this.