Great question — answering as the UphillTech team:
I would assume that the industry itself must store this kind of data somewhere since this is a practical necessity (e.g. people need to be paid residuals,...). There is for instance the Motion Picture Credits Database : Every year, as part of the Academy Awards process, the Academy gathers credits from films hoping to qualify for awards. To these credits, compiled and verified by the film's producer or distributor, we add credits from other films released in Los Angeles County, using research materials from the Academy's Margaret Herrick Library. In addition to personal credits, MPC records index production and releasing companies, MPAA ratings, running times, Los Angeles release dates,...
Full answer by BCdotWEB: https://movies.stackexchange.com/a/24850 (CC BY-SA 3.0).
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