A fashion photographer creates a Private Magazine.pdf featuring behind-the-scenes shots from a Milan runway show. They send it to select editors with a password that expires in 7 days.
A luxury agent compiles a PDF of off-market mansions. They do not want the addresses indexed by Google, so they mark the file as "Private" and share it only with verified buyers. Private Magazine.pdf
Instead of a boring PowerPoint, a Fortune 500 company creates a private magazine-style PDF for new hires, featuring glossy photos of the campus and interviews with the CEO. A fashion photographer creates a Private Magazine
A group of fountain pen enthusiasts publishes a monthly PDF magazine discussing rare inks. It is "private" because it is funded via a $5/month Patreon subscription. Private Magazine.pdf