Ubuntu11.10-> permanently Clear history records of recently opened documents (videos) in Unity

Feasible in 11.10 + unity
1. Clear history of recently opened documents in Unity Code:Rm ~ /. Local/share/zeitgeist/activity. SQLite & Zeitgeist-daemon -- replace

If you want to disable unity forever, you can use Ubuntu Tweak. Attachment:
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2. Clear the recent open history records in players such as gnome-mplayer and totem.Code:Rm-V ~ //. Local/share/recently-used.xbel

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There is a software called activity-log-manager.
You can set to delete records within a specific period of time, set the contents of a specific folder to never record, and so on... Recommended.