Which is the most appropriate encryption method to prevent a user viewing a package but enabling him to run it

Hi,

I need to distribute an SSIS package to another person to use in a demo, but it is very important that I retain the IP, so must only provide him the ability to run the package, and disable the ability to open, view or modify the package. But I am not sure how to achieve this. It seems that EncryptAllWithUserKey will allow "only the user who created the package..." (me) "...to open, view and/or modify, and run the package" - this is part what I need albeit I need to allow someone else to run it.
The EncryptAllWithPassword option protects with a password, but it is unclear if I provide the password to the user who must run it, if he will be able to open, view or modify the package.

What are my options?

Thanks 

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