Is(where clause) login of user

Trying to figure out how to get permissions to look into a keyword field and if the login of the user exists in such field it will not give them permission.  Is there a way to use "Is(where clause) NOT login of user"?  Doesn't seem to work when I put it like that so not sure if I am just missing something simple.  If anyone has an idea it would be much appreciated.  

Dear Phillip Enns! It looks like the Community cannot answer your question. That's why we have opened a Support Request with the Number SR-128179-Q2H4B for you. A Software Support Specialist will contact you directly to follow up. We will update this thread with the solution as soon as we have resolved the Support Request. With best regards, DocuWare Support Team