guest limit

i did a search on guest limit. this is my result.

• 0 - When guest limit is set to 0, guests are allowed unlimited viewing.
• 3600 - When guest limit is set to 3600, guests are are forwarded to signup page after visitor have watched videos for duration 3600 seconds, that is total of 1 hour video. Then he need to register on the site to watch more videos.
• If you set value to 1, since most video's have duration higher than 1 second, guest users will get forwarded to signup page when he click to view a video.

my question is why after setting my guest limit to 1 guest users are still able to view 1 video before bieng redirected to sighnup. and since this does not work how can i set it so no video can be viewed by guest?