I'm assuming you are asking about the web form people fill out and not the form file that contains the design, options, responses, summary. The web form can be accessed by anyone with the URL, you cannot protect it with a username/password. As long as you control the distribution of the URL you probably won't have problems - we do that here at Adobe using Formscentral without any issues.
Thank you for your response,
True as it may, I don't want anyone accessing the form except those authorized. For example, even though the form access can be limited by controlling the dirstribution of a URL, a quick google search of "incident report formscentral" produces a link to the Columbus School District Bully Incident Reporting Form on the first page of results!
In order to limit access, is it possible to Only embed the form on other websites (ones that require authentication), or to only use the PDF version of the form, allowing it to upload the data to formscentral?
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Yes, you could do that to limit access. Embedding the form in your website would give you the best protection (though technically someone could still share the form URL if they really wanted to - they would have to look through the HTML code to do it so its not obvious)