No, thank you. Just publish whether or not clients can simply point their domains to your NAMESERVERS without surrendering their domains.
What you're asking me for sounds too much like you want to sue me for posting.
You can provide your clients web sites in concert with your yellow pages listings without making them sign over the domain by just having the NAMESERVERS changed, so the business practice of demanding custody of the domain is questionable.
I think you can just publish the truth here without requiring so much information.