User blog comment:JAlbor/Assassin's Creed: Black Flag Q&A Opportunity/@comment-79.176.4.112-20130818154704/@comment-4829046-20130818173351

Well to answer your question, these are just memories. You don't need to be a Templar or Assassin to view them. They are using the cloud to allow anyone to visit someone else's ancestor's memories. In this certain case, the player is the Analyst.