Warner Bros. is on shaky ground here. Not only has their registered trademark lapsed, it was only ever valid for clothing. Trademarks are pretty specific. I have registered WikiFur in class 41, so nobody else can start up a informational service named WikiFur. However if someone starts baking WikiFur cakes (class 30), I have a harder time proving infringement.
Arguably what matters most is whether people think the poster was created by Warner Bros. Trademark registration merely acts as notification, which results in a prima facie evidence of trademark infringement if it's used by someone else.
Edit: Well, it turns out they haven't filed a case anyway - yet - so this is all somewhat moot.
Warner Bros. is on shaky ground here. Not only has their registered trademark lapsed, it was only ever valid for clothing. Trademarks are pretty specific. I have registered WikiFur in class 41, so nobody else can start up a informational service named WikiFur. However if someone starts baking WikiFur cakes (class 30), I have a harder time proving infringement.
Arguably what matters most is whether people think the poster was created by Warner Bros. Trademark registration merely acts as notification, which results in a prima facie evidence of trademark infringement if it's used by someone else.
Edit: Well, it turns out they haven't filed a case anyway - yet - so this is all somewhat moot.