Full visibility
Always know who's in the room.
Know who's looked, and when. Every open is a timestamped entry, not a counter, and you get an email the moment someone first views a link. Each link is password protected and named to one recipient, so no account is needed, just the right password. Closing the room locks the record: the cap table as it stood, the full manifest, and the complete access log.
Timestamped access log
Watermarking