I have no idea, but I'd rather not risk it. Odds are, the printing company would take one look at the professionally-designed cover with the Indiana Jones logo, and contact Lucasfilm. It's like using any copyrighted character for fan fiction: As long as the work is distributed for free, then everything is fine. The trouble begins when money is involved (whether trying to sell it, or having it replicated for print). With the free PDF version, it simplifies the problem for anyone who cares to print out a copy for their bookshelf at home. I plan on making a dozen home-made copies to give out as thank-you gifts to everyone who contributed to the story (even though it will cost me a small fortune in paper and computer ink cartridges).