When is it ok to pirate software, if ever?
I think it is ok to pirate software only if the original company that made the original product gives you persmission to do it. But i dont think its ever ok to copy someones product without them knowing or giving you permission to.

Is the author correct? Does piracy encourage people to buy things?
I think the author is right, piracy encourages peoplr to buy things. When a person sees a product he or she likes, they will want to buy the product at the cheapest price. This encourages many buyers.

What should movie companies do to stop piracy?
I think movie companies should place patents on their movies and companys so people will not be able to pirate anything of theirs.