> Let's face it, if someone has hundreds of hours of footage of your work, they can find problems.
Yes but they will have to spend hundreds of their own time to do that (and if they intend to sue you to get their money back, also a lawyer's time.) I wouldn't worry - they will lose their own job long before they find enough evidence to harm your reputation.
Do not underestimate the amount of determination or free time available to an unreasonable client. If they were able to do cost-benefits analysis and good-faith estimates of the value of someone's time, they probably would not have made a request like this to begin with.
In short, do not expect reasonable behavior from unreasonable clients. :)
Yes but they will have to spend hundreds of their own time to do that (and if they intend to sue you to get their money back, also a lawyer's time.) I wouldn't worry - they will lose their own job long before they find enough evidence to harm your reputation.