As Marc Levy said/implied, the threat/fear of legal action is often more effective than actual litigation, and even the retainer for a lawyer could be higher than the licensing fee. The following doesn't refute or confirm what Marc said. It's just more info. In general, the owner of a legally strong (distinctive and unique) trademark or service mark can keep others from using it (or using something so similar that its use would create the likelihood of customer confusion). If you sold a picture of a DeLorean, how likely would it be that the buyer would think you were DMCH? If you sold a "DeLorean Ring" with a DMC logo, could the buyer be confused????? You get into darker and darker grey areas if you sell a "DMC Ring" an auto part with the DMC Logo, or use a DMC Logo on marketing or packaging. On one hand, the pre-existence of the (similar) DMC Logo dilutes any claim DMCH might have about potential confusion. On the other hand, if DMCH doesn't actively and uniformly attempt to defend the logo, they can lose all rights to it. If they hadn't registered it, someone else could have, and even though DMCH couldn't have been forced to stop using it, the new registrant could easily have diluted the logo. Definitions: A trademark is any word, phrase, design, slogan or symbol (including nonfunctional unique packaging) that serves to identify a specific product brand. Examples: Xerox photocopiers, Kodak film and cameras, Exxon gasoline and automotive products, Nike sport shoes, Apple Computer's rainbow apple with a bite missing; the red Coca Cola logo. A service mark is any word, phrase, design or symbol that identifies a specific brand of service. Examples: McDonald's fast food service, Kinko's photocopying service, ACLU legal service, Blockbusters video rental service, the UPS logo (postage delivery service) the U.S. Postal Service's eagle in profile (postage delivery service); CBS's stylized eye in a circle (television network service), the Olympic Games' multicolored interlocking circles (international sporting event). Gary Hull IN2TIME