COPYRIGHT DISCLAIMER UNDER SECTION 107 OF COPYRIGHT ACT OF 1976 ALLOWANCE IS MADE FOR "FAIR USE" FOR PURPOSES SUCH AS CRITICISM,COMMENT,NEWS REPORTING,TEACHING,SCHOLARSHIP AND RESEARCH. FAIR USE IS PERMITTED BY COPYRIGHT STATUE THAT OTHERWISE BE INFRINGING. NON-PROFIT,EDUCATION AND PERSONAL TIPS THE BALANCE IN FAVOR OF FAIR USE.
See: http://www.bitlaw.com/copyright/fair_use.html
Also: http://www.nolo.com/legal-encyclopedia/fair-use-rule-copyright-material-30100.html