The dramatic Waymo v. Uber trade secrets saga may have ended last week, but it’s left the legal industry with questions about more than just self-driving cars—it’s drawn attention to ephemeral messaging.

Ephemeral messages, communications that self-destruct after a given amount of time, came up a few times during the case. Uber faced criticism over allegations its employees used ephemeral messaging, particularly a messaging app made by San Francisco-based Wickr Inc., to  keep sensitive information off company servers. Waymo acknowledged that its own employees use Google messaging systems, which have ephemeral capabilities, but only for ordinary business communications.