When providing a copy to the court, it should also provide relevant evidence such as insiders and witnesses who have no interest in the provider. First, there must be other materials to prove, and second, the other party acknowledges the contents of the copy. In accordance with one of these two articles, the copy can be used as effective evidence, which is determined by three basic characteristics of litigation evidence.

China's "Civil Procedure Law" Article 70 Documentary evidence should be submitted to the original. Physical evidence shall be submitted in its original form. If it is really difficult to submit the original or the original, copies, photos, duplicates and excerpts may be submitted. Foreign documentary evidence must be accompanied by a Chinese translation.