[Zope] Is there a way of protecting your zope source

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Hello all,

I have an oppurtunity to create a web site for a customer. As far as I 
know the zope folder I export can be imported into the zope environment
at the customer site. But the source will also be accessible. Is there
any way of protecting my source code such that the customer will not be
able to work on the source.

Thanks
sathya