I would like to find a way of making sure that the survey is only answered once per person asked.
I know this can be secured with entering a mail adress, but I don't know the Mail adresses, but the people asked will be informed via post. So is there any kind of technique in the background that secures every IP adress is doing the survey only once...or can I give out codes that can only be used once?
Thanks a lot for your help!
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How can I make sure that each "PC" answers the survey only once?
4 years 1 month ago #77009