SimpliSafe, the company behind the well-received SimpliSafe home security service, today announced that Hellman & Friedman, the massive venture fund and private equity firm, has taken a controlling interest in the company. While the two companies didn’t disclose the terms of the transaction, sources close to SimpliSafe tell us that the deal valued the company at about $1 billion. Hellman & Friedman also currently own a number of other brands.