Cheap and relatively tasteful DIY door reinforcement

[ARF-GEF]

Well this is not a lock, but it look to me like a good, cheap, and not too ugly door reinforcement method, which one can easily install himself.
It's called The Door Club Home Security Lock:


http://www.overstock.com/Home-Garden/The-Door-Club-Home-Security-Lock/3034135/product.html

[youtube]http://www.youtube.com/watch?feature=player_embedded&v=7sgNkeZCPQc[/youtube]
https://www.youtube.com/watch?feature=player_embedded&v=7sgNkeZCPQc

Anyhow I thought it would be relevant, interesting and helpful

[Caesarkid1]

These would definitely make no-knock raids more difficult if mounted correctly.

[cheerIO]

I have one for you;

http://www.lockpicking101.com/viewtopic.php?f=9&t=59274&p=435321#p435321

I wouldn't call it tasteful, but it is vintage. and I bet it does the job alright.
And it can be locked from the outside.