I have documents created in Acrobat XI that are protected with an Open Password.
The password contains a hyphen "-".
They open fine in Acrobat XI, but Acrobat DC refuses to open them: "The password is incorrect. Please make sure etc..."
Documents created in Acrobat DC that are protected with passwords that contain a hyphen do not have this problem.
I am working with the latest Mac OSX 10.10.3
Luckily I still have Acrobat XI installed, but it is a problem for those with the new Acrobat DC and the new Reader.
Ton