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Kindly request Roku development team to provide option for the Roku as a whole - the lock will apply to all channels. By making the Roku remote ridiculously simple, Roku has made it too easy to use even for kids. There are only so many places one can hide the remote (or the batteries). A simple solution would be to enable a simple 4-digit access passcode. Parents can enter the passcode via the mobile Roku app to unlock instead of typing the passcode on the screen (to avoid kids reading off the passcode).
I would like to amend the request to include that, not only include a lock on all channels, but rather for Roku to include a lock via a password, using either a number and/or letter combination to selectively lock individual channels.