Why is Wang Zheng's negative missing?

Copyright. The film used by Wang Zheng Photography Company was stolen from other authors, and there was no original film. After being sued by the creator of the park film, the film on its website was removed from the shelf, so it could not be downloaded. The negative is coated with silver halide on the base of acetic acid film. When the light shines on the silver halide, the silver halide is transformed into black silver, which is fixed on the film base after the development process and becomes a common black and white negative.