That is correct. As per the help file here,
"The list of named users is automatically synchronized with the Laserfiche Server, LDAP server, and AD server at a given time interval (specified on the Forms Configuration page). Users are also synchronized between Forms and Active Directory, the Laserfiche repository, or LDAP any time the following happens:"
and near the bottom,
"To allocate or remove licenses from a participant
- To allocate or remove a license from an individual user, use drop-down menu in the License column. Select Yes to allocate a license to the user, selectNo to remove a license from the user.
- To allocate or remove licenses from a several users at once, select the checkboxes next to a user and click the Allocate license or Remove licensebutton at the top of the list."
Users that are removed from the group, will be marked as "invalid" and thus have their license removed. But new users will not be automatically assigned a license. They will show up within the list, but will be left with a default of "no" license until assigned otherwise.
Hope this helps.