If you keep you phone locked by a pin code or a locking pattern. If you initiate an action while your screen is locked by one of these methods, you'll have to unlock your device before you can complete the action.
The reason for that is that we care about your privacy.
drupe has a very strict privacy policy: We do not collect nor store any of your personal information - not about you, not about your contacts, your actions or the notifications you get. As part of that, we do not pick up your pin code or lock pattern - this will compromise your privacy.