Do I need Windows Server CALs for Accpac clients?

For a Windows server running an Accpac server with Pervasive SQL, will I need to purchase Windows CAL’s for the Accpac clients? They will not be logging into the actual server, the server will not be acting as a domain controller, or doing any kind of authentication. The Accpac clients will simply be accessing the Accpac server software and database. I am wondering if this requires Windows CAL’s.