Case study

Please find the article  'U.S. Supreme Court Decision in MGM v. Grokster, June 27, 2005' and read it. Then, please answer the following questions. 1 paragraph for each questions will be fine. The original assignment is writing a 30 pages paper. I just need some comments for each questions that I've brought up.
I know it is a lot of hours work. I will post half of the questions here and half in a separate posting.

Questions:
What were the facts of the case?  (there are a lot)

What is the tradeoff between artistic protection and technological innovation?

Is it important that the technology is peer-to-peer?

How does peer-to-peer work?

What is meant by contributory infringement?

What is meant by vicarious infringement?

What was held in the Sony case?

How does this case differ from the Sony case?

Does this overturn the Sony case?