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How not to allow someone to re-submit the same information such as the Name?Asked by Marwan Alakteb on June 25, 2015 at 07:36 AM limit
You have to set a limit in the form based on a unique question. In this case, you should select the Name field.
This guide should help you how to do it: http://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question.
Let us know if you need further assistance.