Nina Paley, creator of the wonderful and copyright-fraught animation Sita Sings the Blues writes, "All the Flash authoring (.fla) files I used to make Sita Sings the Blues have just been posted on archive.org, under a Creative Commons Share Alike license. Want to know how I got a certain animated effect in Sita Sings the Blues? Open up the .fla files and find out. Want to put flying eyeballs and demons in your next music video? Now you can. Want to make a 'Sita Sings the Blues' video game using all the assets? Go for it. (But I strongly suggest you negotiate my endorsement if you want to actually market the end product.)"