How can I prevent Applications from being copied to external drive?

Hello,
Just a quick one...
I run a studio in an education evironment. We've got quite a lot of software installed on our machines (Mac OS X 10.7.4) and there's always the chance that students will copy applications from the Applications folder onto an external drive to take home!
Obviously this is becoming increasingly easy with large USB sticks and Applications which are entirely contained in the Applications folder.
Is there any way that students can still run these applications during class but prevent them from copying the whole applications?
With thanks in advance,
Lawrence

You can hide the Applications folder, but it isn't a total solution. Open Terminal and type:
cd /
sudo chflags hidden /Applications

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