Were the framers of the Constitution or the barons of Old English law able to look over your shoulder, they would be puzzled by your doubts because all of the above uses are legal. Intellectual property was created to promote the public good. In old England, if you wanted to copyright a book, you gave copies to the universities. According to Supreme Court Justice Sandra Day O'Connor, "The primary objective of copyright is not to reward the labor of authors...but encourage others to build freely upon the ideas and information conveyed by a work." In other words, copyright was created to benefit society at large, not to protect commercial interests.

Make sure to check the quiz, answers, & chart
http://www.techlearning.com/db_area/archives/TL/2002/10/copyright_quiz.php
http://www.techlearning.com/db_area/archives/TL/2002/10/copyright_answers.phphttp://www.techlearning.com/techlearning/pdf/db_area/archives/TL/2002/10/copyright_chart.pdf