Your own argument and opinions. Did you agree or disagree with the rulings. Provide some authority for your argument such as quotes from the book.

"Computer Associates Int'l v. Altai: The Altai case itself dealt with whether a computer program interface was entitled to copyright protection. After court applied the filtration process to the interface in question, nothing was left to protect: thus, copyright protection was denied." ...pp226 Nolo

I agree with this ruling that everything can't be protected under copyright law such as ideas, elements by efficiency, external specifications, and material taken from the public domain

"Feist Publications Inc. V. Rural Telephone Service Co.: Feist argued that it wasn't fair to allow a competitor to capitalize on the labor and expense that had gone into the original directory, the Supreme Court ruled that copyright only protects original expression, not labor and expense." ...pp259 Nolo

I agree but with regret. The court ruled that information contained in phone directory was not copyrightable, and that therefore no infringement existed. the loss of revenue due to the expense of your directory is a hard nail to chew. Information is not copyrightable and it didn't have any or very low originality of creativity expression was involved to be protected by copyright laws. Prior to that ruleing there was the sweat of the brow doctrine that allowed anyone who invested time and energy into their work.

9. How much of audio can be used before it is concerned stolen, for a profit
video and a not for profit video?

Less than 2 seconds of a song can be sued for violation of copyright laws. ...Todd Uglow

10. If I make a video or a song that is a free project with partners and one of
them sells the project can I be compensated?

It depends on the partnership of the project if they had a legal agreement or a contract. A lawsuit can be pursued and can be compensation for your percentage of work on the project. ...Todd Uglow