Does anybody know where I can get some information on how to market and sell tutorial DVDs for producing effects? I'm looking to create one, but don't know of any resources to look at to see if its worth producing it. I could try to sell the thing on my own website, but how would one protect the DVDs from piracy? I realize that piracy is inevitable, but I'm sure there are some precautions that distributors have taken to protect themselves against this. Anyways, any pointers would be great!