How to make sure the photos are original?

1 Need unprocessed picture information and other photos taken at that time.

If it is a professional exhibition, you can request the original files.

None of the above may be true, but the original author is required to sign a formal agreement to ensure originality, no more than one draft.

Just as some articles are difficult to identify, we can only rely on agreements and laws to restrain contributors and help whistleblowers to be severely punished. )