Despite being an Adobe product, Adobe Reader for Android doesn't seem respect Adobe's permissions properly - If I create a form in Acrobat XI Pro with a security that allows 'everything except extraction', or even one that specifically is set to "Allow form editing and signing", the app will not allow that form to be filled.
On top of this, a PDF that just has an open password and nothing else, even once successfully opened, can't be signed at all. Even if it has no content security.
A permissive security will -often- be used to protect metadata so that the Author stays the author! As well, legal documents from law firms and such are often password protected on opening, and still need to be signed once they give you use proper password.
If there is a way around this, I need help finding it.
Thanks for your request. We currently do not support this, we have made a note of the same and shall try to incorporate it soon.
Adobe Acrobat Team
I'm sorry, and who are you? A recently created, generic sounding name with no credentials to make admin level statements?