I need to send an assembly to a customer so they can incorporate it into their design schematics (to check sizing, fit, etc...). However, I don't want them to be able to modify it (or open it up, etc...as there are components inside) in anyway. It, and others, will eventually be available on our website as well for this purpose. What is the best format to use in this case? Thank you in advance for your advice. PS: I am using SW2014.