As I wait for Claris to return my email to answer the question "how many copies of FileMakerServer (FMS) can I run under this license"...
Thanks to Claris Studio now available! - #4 by planteg I found links which takes one to actual License PDF:
Which says this:
(b) License Grant. Licensee represents that the “License Count” provided by Licensee is its current total headcount for Licensee’s entire entity as identified by Tax ID#, site address or other identification acknowledged in writing by Claris. Upon payment of all applicable license fees and subject to the terms of this Agreement, Claris grants to Licensee a non- exclusive, limited term, nontransferable license to (i) make exact object code copies of the Software, and (ii) install and use such Software on computers owned or leased by Licensee at its site. Licensee may not install more copies of Claris FileMaker Server or Claris Server software than the License Count.
(emphasis mine)
I am not a lawyer, and this is not legal advice, but it sounds like if you had a 30-person license, you could install 30 copies of FMS.
However, it also sounds as if the Licensee must be a single entity as described (in 1.d.i):
(i) Licensees. The Software may be used by all employees of Licensee as identified by the Tax ID# or other identification acknowledged in writing by Claris, provided that such employees are included in the License Count. Temporary employees, contractors, and consultants of Licensee may also use the Software in connection with the operation of the business of Licensee so long as such temporary employees, contractors and consultants were included in the License Count. [...]
They include a special clause for education, which is nice (1.d.ii)
(ii) Education. The Software may only be used by Licensee’s enrolled students, faculty, teaching assistants, administrators and staff on Licensee’s computers at facilities governed by Licensee during the term of the Agreement.
Also, the License does not mention "anonymous" users by that term, but it does discuss it in section 1 (e):
(e) Clients. Claris FileMaker Server Software includes the rights to access data stored in the database server using Claris FileMaker WebDirect web browser clients, Claris FileMaker Go clients and Claris FileMaker Pro clients (collectively “FileMaker Client(s)”). Claris Server Software includes the rights to access data stored in the database server using Claris WebDirect web browser clients, Claris Go clients and Claris Pro clients (collectively “Claris Clients”). Each Authorized User may use any Client to connect to
Claris FileMaker Server or Claris Server, however only FileMaker Clients can connect to Claris FileMaker Server and only Claris Clients can connect to Claris Server.
Claris FileMaker WebDirect and Claris FileMaker Go version 19 clients are not restricted for use by Authorized Users (as defined in Section 1(d)) when connecting to Claris FileMaker Server version 19.
(emphasis mine)
I'm still not sure if this license will work for my needs, but it is nice that Claris seems open to making changes to meet our needs...