What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Though this is not possible to do in JotForm, once the PDF is created I believe it is possible to do in a program such as Adobe Acrobat:
Though you cannot add a password to signed or certified documents and you do need a Pro or better version of Acrobat for this functionality. It is not available for the free version.
Let us know if you have any further questions and we will be happy to help.