So there should not be a copy of the license you just moved still on the USB flash drive to move to other workstations.
You must use the EvMove utility, which only moves the files and does not perform file copying. Note: You cannot simply copy the activation files stored on one hard drive to another hard drive. This is referred to a Node-Locked license as you can only use the licensed software product on one Node (computer) at a time. This then ties the license to the local hard drive. This is because the files are moved, not copied, to the local hard drive off of the removeable device, whether floppy disk, CF card, or USB flash drive.
With the older EVRSI activations you can only move the license files around to one workstation at a time.