Here is a quote from IDS Licensing conditions document:
The Client License entitles the Licensee to have the software used by one nominated natural person ("Selected User") for the Licensee's internal and own business transactions. The Selected User may install copies of the software on any number of devices (hardware) in so far as the Selected User is the only natural person to use each such installation of the software. Installation on a network for use by several Selected Users is permissible subject to the condition that the Licensee has purchased a separate Client License for each Selected User. The Licensee shall be entitled to replace a given Selected User by another Selected User in so far as it ensures that all the installations of the first named Selected User are deinstalled.
Thanks for the info.It helps!