What type of photo "negatives" do I give the model and makeup artist?

Apple

New member
I hired a model and makeup artist for trade of services. They allow me to use them so I can build my portfolio and in turn I give them copies of the photos for their portfolio.
My question is:
Do I give them a CD with watermark prints and let them decide what paper prints to get?
I am in fear of having my images stolen and having someone take credit for my work. (image theft)
What should I do?
 
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