Indicates that the PDF form prompts the user for a password to open the form. You are prompted to set the password when you save the form design in PDF.
Removes the passwords required to open the PDF form and print and edit the document. You are prompted to set the password when you save the form design in PDF.
Indicates that the end user must provide the correct password in order to print and edit the PDF form. The end user is prompted to set the password when saving the form design in PDF format.
Indicates whether the user can make changes to the PDF form. If you want to allow changes, select the type of change that the user is allowed to make. Options include:
Indicates that the user can access the document using a screen reader device.
See also 

PDF Security tab (Form Properties dialog box)