Disable Access to review

Hello,

We have been happily using review to gather feedback from a small group.  I would now like to 'suspend' access to all but 2 of the members of the group, who have the final say on which suggestions are implemented. 

Is there a way to generate a new link so I can distribute it to the two 'super reviewers only?  I tried to change the password, but it seems like the other reviewers are still able to access the course, even after I have changed the password (saved cookie?) 

In any case, does anyone have any insight into how to accomplish this?  

Thank you, everyone, in advance for your consideration.