Receiving pop up saying "would like to paste from Safari” when download apps

Why when I download certain apps, a pop-up will appear that says for instance, the app TickPick… a pop up will appear that says “Tikpick would like to paste from Safari”… again it could be any app that I’m downloading but a pop-up message like that will appear. What does that mean?

[Re-Titled by Moderator]