There is no way to add or remove password protection to and from PDF's using Adobe's own app. It's a major headache and people have to use third party apps. I often add the encryption to sensitive documents I've scanned using another app, but now there's no way to remove it if I wanted to, because I delete them from the other app once I've uploaded it to Adobe. And other documents I've scanned and uploaded I want to add encryption to later, I cannot do that either. I'm very anxious trying to decide if I should or shouldn't add it since I only have one chance for the rest of my life. I have no computer as many people don't these days. Could you please add the ability make a password and turn encryption on/off for each PDF in your app? Sometimes I might want it on and other times I don't -- when sending it to certain sources, etc.
Thank you for sharing your feedback.
We appreciate your feedback. Currently, the feature is not available in Adobe Acrobat Reader mobile application.
You can fill the feature request form for the same here: Feature Request/Bug Report Form
Let us know if you need any help.