It's like: John Doe asks, "Hey Larry, did you let Zuck read my mail I wrote you last week?". Larry says, "No! He doesn't have my password or yours, right?" J

It's like: John Doe asks, "Hey Larry, did you let Zuck read my mail I wrote you last week?". Larry says, "No! He doesn't have my password or yours, right?" Joe persists and proves Zuck knows the contents of the email. Then Larry shrugs and says, "Well, I didn't give him access to your email, I gave him a print out when he asked for it".