When William Talcott, a prominent San Francisco poet, died in June, he apparently took his email password to the grave. It’s a vexing, and increasingly common problem for families mourning the loss of loved ones. As more and more people move their lives, address books, calendars, financial information, online, they are taking a risk that some information formerly filed away in folders and desks might never be recovered. That is, unless they share their passwords, which poses security threats.