I am currently a non-premium Evernote user on four platforms - OS X, Windows, iPhone, and iPad. If I purchase a monthly Evernote Premium license, will it cover all of my platforms? Is the license tied to my Evernote account independent of how I access it? If so, once I purchase a Premium license, then will I be able to save local notes to my iPhone, iPad Air, and iPad Mini as long as they are associated with the same Evernote account? In this case, I assume I need only purchase one Premium license to cover all platforms?