Well, you should have "Propietary and Confidential" on every page of the document. Your lawyer will probably insist on an NDA or MNDA (Non Disclosure Agreement or Mutual Non- Disclosure Agreement) though I'll tell you, those are hard and costy to go back and claim damanges on. My suggestion would be to provide only enough informaiton for them to understand what you are proposing but not enough to give away all the thoughts on execution. If it is a large corporation wiht ops in your home country, they won't want to do anything too blatent to steal your ideas.

