Help with Microsoft Word (MS Word questions)

I have recently paid out a large sum of money for the preparation of a 90 page risk assesment document and I would ideally like to email it as an attachment to my customers but I don't want anyone copying it and using it for theirselves.
Is there a way of securing the document so that it cannot be copied other than by typing it out again word for word.
I was also thinking of something like a watermark on each page to identlfy it's source.

Depending on how many people you have to mail it out to, consider sending each person a slightly differently-worded version, so if it does leak, you've got a chance of identifying who sent it.