Higest security locks!!!

[Rami_11]

If you don’t want somebody who is unethical to make a copy of your key, restricted keys nip that option in the bud. If you are at work and you put your keys down, you don’t need to worry. If you have people who you lend your keys to like your maid, temporary roommate, or friend staying at your place for a week, you will feel comfortable knowing these people cannot make a copy of the key because it is restricted. So it is often not just that these locks are high security, meaning they are virtually unpickable. But they also provide restricted keys, giving people the added security of knowing they are the only ones who can copy their key.

[MacGyver101]

In general, that's not bad advice. It gets a little more complicated than just "restricted keys", though. If you're evaluating a restricted key system, you need to ask yourself a few other questions, such as:

• How long is the patent on the restricted keys valid for? (Once the patent has expired, they're no longer "restricted": there are many examples of previously-restricted keys that you can now get aftermarket blanks for.)
  
• How hard would it be for someone to modify something else to simulate the restricted key? (In some cases, you may be able to file down the warding on a different blank... and people have even demonstrated duplicating Medeco keys onto pieces of plastic or filed down flat-steel keys.)
  
• Can your restricted key blank be duplicated on something like an Easy Entrie milling machine?

Restricted key blanks certainly will prevent 95% of the "casual copying" opportunities that might occur if you loan your keys out to someone... but it may not help much against someone who's really motivated to make a copy.

[MacGyver101]

Okay... I have the feeling that I've been responding to some sort of spam engine. This post is a paragraph from yodle.com.

[Oaklandishh]

If it makes you feel any better, I thought your post about the easy entrie machine was interesting?

[MacGyver101]

Thanks.

(And, just to be clear... that site belongs to another member here!)

[lockpick1968]

In general, that's not bad advice. It gets a little more complicated than just "restricted keys", though. If you're evaluating a restricted key system, you need to ask yourself a few other questions, such as:

• How long is the patent on the restricted keys valid for? (Once the patent has expired, they're no longer "restricted": there are many examples of previously-restricted keys that you can now get aftermarket blanks for.)
  
• How hard would it be for someone to modify something else to simulate the restricted key? (In some cases, you may be able to file down the warding on a different blank... and people have even demonstrated duplicating Medeco keys onto pieces of plastic or filed down flat-steel keys.)
  
• Can your restricted key blank be duplicated on something like an Easy Entrie milling machine?

Restricted key blanks certainly will prevent 95% of the "casual copying" opportunities that might occur if you loan your keys out to someone... but it may not help much against someone who's really motivated to make a copy.

I have to agree that the security may last for a while but in time and a person is dedicated enough it will get comprimised one way or another.
If they are determined and have the will then they surely will find a way.