Restricting permissions

I'd like to use Jython as a scripting language for an editor I'm writing 
in Java.  This editor loads, modifies and saves XML files.  I want to 
provide the ability to write macros to automate editor processes.  
However, I want to prevent these macros from accessing the filesystem or 
the network.  Is there a way to do this?

Thanks,

Mark McKay
http://www.kitfox.com


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