While this requires little to no action on your part, it's still important to know what other steps BlackBerry has taken in order to keep your Android-based PRIV secure.
First off, PRIV has something called Hardware Root of Trust – a unique manufacturing process that injects cryptographic keys into the device hardware, providing a secure foundation for the entire Android platform. Following that is a Verified Boot and Secure Bootchain, which uses the embedded keys to verify every layer of the device from hardware to Android OS to applications in order to make sure they haven't been tampered with. Wrapping it is a full-disk encryption.
Wait, if all this is possible, why didn't Google include encryption prior to BlackBerry's solution?
Dave Kleidermacher, BlackBerry's chief security officer, explained in a VentureBeat article about BlackBerry's underthe-hood security and why it offers a little more than what Android OS could. We paraphrase what he said that gets the essence of BlackBerry's superiority in security and why it's possible with the PRIV.
“The algorithm for measuring authenticity, for example, you don't want to run on (older) Android OSes. Google, really from Lollipop, started to maximally leverage what they call the trust-execution environment…it's a trusted area to run and store critical things like encryption keys, so that they are better protected than if, say, they were stored on the Android file system. Being able to do that was made easier.”
It sounds like marketing speak, but by saying that their own security measures are better and deeper than what tech-giant Google offered (until Lollipop came along) onrecord is a good indicator of the work poured into securing the PRIV for user privacy.