PDF received is editable

Hi,

I uploaded a plain PDF and added the text input fields and linked them to my WP Form. WHen I go to the form page on the website, fill it in and submiot, I receive the email with the attached PDF.

However, the attached PDF is editable, i.e., I can edit the form field data. Is there an option to receive a plain PDF with the form fields displayed?

Receiving an editable PDF is not good as the we want our clients to receive a PDF of their form and not change it afterwards in the PDF; this defeats the purpose.