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I cloned your form and did some tests there. During my tests with the edit link, the hidden fields are not visible and the read-only fields cannot be modified.
Please note that hidden and read-only fields can be edited by the form owner. This means that if you are currently logged in to your account and you edit the form through the edit link, then you will be able to see these hidden fields. But if you are not logged in to jotform and you visit the edit link, you will not be able to see the hidden fields or modify the read-only fields.
Hope this helps. Please let us know if you need further assistance.