Rails - Jun 2014 - Protecting the Ruby on Rails source code (encrypting and making the code compilable and not to view)

I am trying to implement my application in my client place and the 
application is developed in Ruby on Rails.

Since I am going to deploy on their premise I wish to make the code as 
encrypted can be compiled but not be able to view, use or copy.


How can I do that using open-source tools.

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