Template:Copyleft

  creates an symbol (using Image:Copyleft.svg) that, when clicked, takes you to the Project: Copyleft page explaining what the concept is.

Copyleft should only be applied to content which you own the full and complete copyright on. If you don't, you cannot legally release that content under copyleft. You can release a picture of a toy which you took under copyleft. A picture of that toy from a website, or a stock photo of it cannot- because you did not generate it and do not hold have the right to release it.