BDB and License

Hi

I want to use OpenLDAP.(GitHub - openldap/openldap: Mirror of OpenLDAP repository, The OpenLDAP Public License Version 2.8) OpenLDAP uses berkeley DB 5.3.21. In addition,, openLDAP version is 2.4.49.

1. Berkeley DB(BDB) 5.3.21 is sleepycat license, right? 2. When I use OpenLDAP, should I disclose source code of commercial SW? or Can I use OpenLDAP without disclosing source code of commercial SW? 3. When I do not link with OpenLDAP directly. I connect to another open source without link such as http, jmx etc and it connects to OpenLDAP, should I disclose source code of commercial SW? 4. When I distribute commercial SW using OpenLDAP, should I use sleepycat license for berkeley DB or should I purchase BDB?

Thank you.