Third-party elements permitted by Public Domain and E.U. freedom of expression, creativity and innovation:
E.U. Charter of Fundamental Rights Article 11(1).
E.U. Directive 2001/29/EC Article 5(3)(k): "use for the purpose of caricature, parody or pastiche". 

"A parody is simultaneously copy and creation. The nature of parody requires borrowing elements from earlier works. These elements borrowed can consist in essential elements of the original work as for the parody to be successful the earlier work must be recognisable to the public. But the parody is also creation as the parodist distorts the original work and it is in his interest that the public does not confuse the new work with the original work". 
- The Advocate-Generals opinion in the Deckmyn case
