The plaintiffs are the right holders of the comic books entitled "Lucky Luke".
The defendants, a Belgian politician and the political party of whom the first defendant was the president (Lijst Dedecker), had used for a political campaign an image from one of those comic books depicting Lucky Luke, the hero, and the Daltons, four brothers which are the villains throughout the whole series of this comic book.
In the image, the face of Lucky Luke was changed in that of the first defendant, whereas the faces of the Daltons were changed in those of the leaders of several political parties in Belgium. The image was completed with a reference to the political party of the first defendant.
According to the plaintiff, the use of this image violated the plaintiff's copyright. In addition, according to the plaintiff, this use also constituted an unfair commercial practice.