This is interesting - I can't tell from the article if the text message was divulged by the receiving party or through a subpoena. I understand that SMS can be

This is interesting - I can't tell from the article if the text message was divulged by the receiving party or through a subpoena. I understand that SMS can be captured by the provider and they can be subpoenad, but what about messages sent via a third party service (iMessage, WhatsApp, etc) that are (at least notionally) encrypted and not visible to the service? Would an individual be compelled to present these in court?