How can i protect a external hard drive

The only real safe method is to buy another one. Mirror your main one to the second one and give that to your kids.
 
copy it all onto each pc or at least one of them.. problem fixed...

obviously the data is not important or you would have a backup?
 
If you've got a network, which you probably will have if everything has internet access, then just leave the HD connected to your PC and share selected folders.
Your router might even have a USB port for sharing HDs over the network.
 
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