Mailing the story:

In May 2014, Life360 CEO Chris Hulls received an aggressive patent demand letter. The letter, from lawyers representing a company called Advanced Ground Information Systems (AGIS), told him he needed to pay for a "royalty-bearing license" to its four patents, or Life360 and its customers would have to "cease and desist" from infringement.

In other words: pay up, or shut down your company. The letter demanded a response within three days.