It could be written as a simple module and a class could get the behaviour with `#extend` instead of `#include`.
```ruby
module Authorization::ActivationKey
  def readable(org)
    ActivationKey.readable?(org) ? where(:organization_id=>org.id) : where("0 = 1")
  end
  # ...
end

class AClass
  extend Authorization::ActivationKey
end
```