I have always ask pro photographers for the original, especially when they expect good output.
For legal reasons, you can always set up a NDA, CA, CDA, PIA etc.
The point is if everyone co-operates then no one (usually contractor/subs) have to put in time for free,
and let's face it, if the engineer/photographer could do the service you offer for the price you
charge, then why would they be coming to you in the first place? =)
More than anything, it's about co-operation and respect in the age of specialization.
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