The USERBASED and HOSTBASED directives reserve a number of licenses (all or a specified number) that will be available only to the named users (for USERBASED) or hosts (for HOSTBASED). The users or hosts must be specified in the reservation lists of the license server, or you will get a warning in the license server log that the license is not available for usage.
Although they are not mutually exclusive, normally only one of these two keywords is used at one time.
This directive can be used only with network licenses; accordingly, the COUNT directive must be set if USERBASED or HOSTBASED is set.
Usage and recommendations
Making a license user- or host-based effectively makes it a "semi-floating" license, as you must specify in advance who can use the license. This licensing model can be beneficial for such uses as applying a discount to floating licenses, since it places restrictions on the floating license but is not as rigid as a local license.