Though I think that box is ugly and impractical, I'll wait for artificial eyes or systems tapping the optic nerve.

For one, in many states it is illegal to record a conversation without the consent of all parties. (In most states it is illegal to record a conversation without the consent of at least one party to it.)

You'd literally bump into people at the supermarket and say "My, what a beautiful child you have and BY THE WAY I'm wearing a discrete wire please don't talk unless you want it recorded."

You might be recording images & audio without the rights to do so.

I wonder if you could prosecute a person with photographic memory for the very same thing: "recording" images and audio without the rights to do it.

However, there is also part of copyright that involves "fixing" a work in a medium so that it can be reproduced. With the rather vague caveat of unless it's for "transitory duration".

There is even debate on if a RAM buffer constitutes infringement. If I recall some lectures on this Sony ran into this problem when they started offering RAM buffering on their CD Discman devices (although the issue goes right back).

However, this recently got challenged with a series of decisions that went the other way - RAM buffers were fine - These decisions had more of a focus on the "economic value" that can be derived from a copy... It also accepted the fact that the practice is widespread and essential in most electronic devices.

So in light of the later trend... You're probably ok.