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.
If I understood you correctly, you want to provide access to your client only for data that are collected form their forms. You can add them as sub account users of your account and give them permission to view only submission of their form. Inside of this guide you can find out how to share forms with a sub account user: http://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User
Your client first need to sign up for JotForm by registering for a new account. Then when you share form with them, they will be able to view shared form on their account.
Hope this will help. Let us know if you need further assistance.