Ruby class inheritance: prevent methods to be overriden

override_prevention.rb

class Product
  def self.inherited(sub)
    sub.class_eval do
      def self.method_added(name)
        if [:method1, :method2].include?(name) 
          remove_method name
          raise Exception, "Can't override #{name} method"
        end
      end
    end
  end
end

class CreditCard < Product
  def method1
  end
end
# will return `Exception: Can't override method1 method`