A Brazilian judge has ordered local cellphone carriers to block WhatsApp on their networks for 72 hours, effectively locking out over 100 million users from the Facebook-owned messaging service. The ban, which started Monday afternoon local time, appears to be a result of a dispute over WhatsApp's move to encrypt 100 percent of messages on its service. As TechCrunch reports, Judge Marcel Montalvo ordered WhatsApp to hand over chat records related to a drug investigation, but the company argued that it does not keep such records and could not decrypt the data even if it did. Therefore, it can't deliver something it does not have access to.
Update: Whatsapp boss Jan Koum says in a post on Facebook that while it is working to get services back online in Brazil, "we have no intention of compromising the security of our billion users around the world."