ubuntu - Linux keylogger without root or sudo! Is it real?

Somebody on Youtube claims to have a keylogger on Ubuntu that was neither executed nor installed as root. The link below shows a demo of it working.

http://www.youtube.com/watch?v=Y1fZAZTwyPQ

Despite their claims to the contrary, this person could have installed it as root before demonstrating for the video. Is there any other semi-credible evidence that this is really possible without root for installation or execution?

UPDATE: The software referenced in the June 24 answer wouldn't install without sudo/root. I've added a bounty to whoever gives a link to a working Linux keylogger software that can be installed and run with regular user privileges.

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