As far as I'm aware, RoboHelp has always had this type of licensing. One PC user per serial number. Now that single serial number may be installed on any number of PCs you want. But it may only be activated on a total of two PCs, with the thought that the single user uses it either on a work PC or a home PC.
Perhaps an organization can only afford to acquire one RoboHelp license, but they have perhaps three or four authors that need to use RoboHelp. One way to deal with that is to install and activate it on one PC, then allow the users to use that one PC. Either by physically sitting in front of it, or by using a remote desktop session to "drive" it from a remote PC. But that would still mean only one person at a time was using it.