Safe, legal and ethical use of digital information & technology:

• Sites such as Turnitin.com—which compares electronically submitted student work with a huge text database to see if the work is copied. 
• The problem of ethical use goes beyond plagiarism, however. Even when properly credited, not all published work can be used in another work. 
• Student-made productions, like glogs and blogs that combine digital media, must still meet so-called fair use tests. Fair use of copyrighted work is allowed if the new work (e.g., a student online video presentation using clips from film versions of Romeo and Juliet) incorporates the film in a way that substantially differs from the original intent and value of the older work—the law phrases this as ‘transforming’ the original work. 
• http://www.hepg.org/hel/article/511