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You'd have to get the person to sign up and use a login, to which you add a unique identifier and assign that identifier to the photo vote. eg. their email address is a good one.

Obviously the problem here is you can't stop someone using two different email addresses or user accounts to vote more than once.

Good Luck

Dean

In reply to Re: blocking IPs by crabbdean
in thread blocking IPs by Anonymous Monk

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