Article R321-5 of the French Intellectual Property Code
The list mentioned in Article L. 324-14 specifies at least, unless impossible, the following elements for each work or protected object: 1° The title; 2° The name of the rightholder(s) when they are known but could not be located; 3° The name of the original publisher or producer; 4° Any other relevant information available that could facilitate the identification of the rightholder(s).