Bill Watterson (creator of Calvin & Hobbes) is known to be quite obstinate about not letting his famous creations to be licensed for commercial purposes. He has stopped drawing the comic strips since 1995, and has stayed away from the spotlight.
It is conceivable that a authorized full length animation film or TV show featuring the dynamic duo, may never be produced. For now, we will have to make do with the unauthorized underground stuff, floating around the Internets.
Watch this unofficial piece of Calvin & Hobbes animation, created by Donato Di Carlo as a project for the CFP Milano Film School in Italy. The short film is in Italian with English subtitles. Notice how Calvin has some very Italian hand movements. Great Stuff.
Related: Calvin & Hobbes – The Psycho Version.