Analyzing executive privilege: when can it be used?

According to an authoritative Congressional Research Service history of executive privilege, at least three important elements must be present for a legally correct assertion of the power. First, the communication the president wishes to withhold must bear on a core power of the presidency, such as the right to grant pardons or conduct law enforcement. Second, the communication must have come from or to the president or a close White House adviser. Third, the communication can’t contain info so unique that investigators can’t figure it out by looking elsewhere.

Read #2- So these documents to be protected came from the president or one of his advisers... and is related to F&F? HMMM