Independents - Protecting your specs from unathorized use

Hello, I have enjoyed reading through a lot of information on this website. I need to set up an account. I am wondering though, among independent spec writers, how many of you use protect/secure your documents with a password?

I am asking from the perspective of protecting your copyrighted specs from unauthorized use by clients.

And, I guess a second question would be do you provide spec manuals to your clients in Word format?