Sample files used for testing DPX parsing and conversion to and from FFV1.
They have no specific license.
From https://samples.ffmpeg.org/image-samples/dpx_samples.zip "they will hopefully be useful for other developers, too"
From https://trac.ffmpeg.org/ticket/5639
From https://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket2392/converted_image_gets_skewed.dpx
Home made.
Old files with no high value content and without explicit copyright.
Expecting that it is considered "fair use".
From OpenEXR repo
Provided by sponsors with explicit authorization to make them public for testing purpose.