Anyone have a pdf to download of that document? That website is no longer up and running.
The WTS have this to say in their latest Watchtower so I think they are lying about having trademark protection:
April 2018 Watchtower Study Edition, Pages 30 & 31
As is clearly stated in those Terms, no one is permitted to “post artwork, electronic publications, trademarks, music, photos, videos, or articles from this website on the Internet...”
By securing copyright and trademark protection, we have a legal basis to prevent such misuse.