The mirror is not yours because shows my face
If this situation happen is a serious warning about legalities and quality issues.In my opinion, this situation might happen because the following reasons.
A- Most important one, is because the customer did not like your final edited work and think that somebody else can do it better.
B- Fees were overcharged according to the final product, then customer want take the most he can.
C- By the lack of details in the contract if any contract done, customer might detect the videographer is not experienced about those legal terms and then want exercise the untold rights over the fees.
If Customer ask raw files, this means this detail was not discussed or even considered as a term of the assignment.
D- The mirror is not yours because shows my face. The customer is IN the video, but only belongs to him what is paid for. Not all, if customer is fair, he will pay extra for the raw files even is a kind of insulting situation for the artist who created the footage or assembled the images.
I don’t think to please a customer who wants raw footage is a customer who will refer more business, obviously he is not happy with your work or he is panning to do something else with that footage but without you.
A couple of times this happen to me. I told the customer, that once I finish the edition and the customer accept the final video I “delete” unused files and “only” keep a copy of the delivered video for a while because actually I don’t provide archival service for video. The other time I was asked to deliver also the raw footage I give only the footage that contained the parts used in the final video they got and accepted as delivered work.
Is different if the customer ask me if I have some extra footage can be use in a longer or more funny, etc. version and they are willing to pay or re-arrange the editing style and do sub-versions for different use if worthy the event, location, etc.
I have a different fee when customer wants raw files. Because if videographer is hired for the raw files he must shoot different way than for his own workflow. If I shoot for a customer who want also raw files I shoot longer shots than if is only for my workflow that I know what is really objective. Anyway is unpleasant situation.
A very clear and detailed contract is much better than a legal discussion at the end.