I have PDF file that consists of various photos, a media music player, and some text I wrote with the PDF maker before "rendering it" to its final version in PDF.
I followed an Adobe tutorial which assisted me in changing permissions (Encrypt » Password security). I verified that every option was as I liked (Changes allowed set to none), but then when I opened the "format saved PDF", the PDF version of the one I was working on, changes could still be made to it.
How do I get around that so when I publish and distribute my PDF file, no changes can be made in it?
