To prevent your private magazine from being leaked on torrent sites:
What makes a “private magazine” compelling is its rejection of virality. It is deliberately contained. Each PDF becomes a time capsule of a particular aesthetic or community, often designed with care in InDesign or even LaTeX, then quietly shared as a keepsake. Private Magazine.pdf
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. To prevent your private magazine from being leaked