Content locker OFFER DETAILS?

Hey again guys,


My website is based around the use of a content locker.


I been learning about content lockers and I've came to find that when someone completes a survey they cannot complete the same survey? AGAINN?(If they want to re access the content)


Like, If you have already entered an email address into a content locker offer. You can only use that email once?


Is this correct?

Thanks,
Curtis