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Cs 196 Presentation


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Cs 196 Presentation

  1. 1. Copyleft and Copyright For the future of learning and GREAT JUSTICE! Agustin, Lorenzana, Ng
  2. 2. Copyright and you <ul><li>What is copyright? What is it for? </li></ul><ul><ul><li>– noun   the exclusive right to make copies, license, and otherwise exploit a literary, musical, or artistic work, whether printed, audio, video, etc.: works granted such right by law on or after January 1, 1978, are protected for the lifetime of the author or creator and for a period of 50 years after his or her death. </li></ul></ul><ul><li>But you already know that...(assuming you've been paying attention to the past reports) </li></ul>
  3. 3. Here Comes Copyleft <ul><ul><li>What is copyleft? </li></ul></ul><ul><ul><ul><li>Copyleft is a play on the word copyright to describe the practice of using copyright law to remove restrictions on distributing copies and modified versions of a work for others and requiring that the same freedoms be preserved in modified versions. </li></ul></ul></ul><ul><ul><ul><li>Also known as viral licensing. </li></ul></ul></ul><ul><ul><li>But not all free software is under copyleft </li></ul></ul><ul><ul><ul><li>Example: Apache license </li></ul></ul></ul>
  4. 4. Types of Copyleft <ul><li>Strong and Weak </li></ul><ul><li>Full and Partial </li></ul><ul><li>Share-alike </li></ul>
  5. 5. Strong and Weak <ul><li>Strong </li></ul><ul><ul><li>“ the copyleft provisions can be efficiently imposed on all kinds of derived works ” </li></ul></ul><ul><li>Weak </li></ul><ul><ul><li>“ not all derived works inherit the copyleft license; whether a derived work inherits or not often depends on the manner in which it was derived.” </li></ul></ul>
  6. 6. Full and Partial <ul><li>Full </li></ul><ul><ul><li>“ all parts of a work (except the license itself) may only be modified and distributed under the terms of the work's copyleft license.” </li></ul></ul><ul><li>Partial </li></ul><ul><ul><li>“ exempts some parts of the work from the copyleft provisions” </li></ul></ul>
  7. 7. Share-alike <ul><li>The requirement that any freedom that is granted regarding the original work must be granted on exactly the same or compatible terms in any derived work </li></ul><ul><li>All copyleft licenses are share-alike! </li></ul>
  8. 8. Examples <ul><li>GNU General Public License </li></ul><ul><ul><li>Strong copyleft </li></ul></ul><ul><li>Mozilla Public License </li></ul><ul><ul><li>Weak copyleft </li></ul></ul><ul><li>WTFPL </li></ul><ul><ul><li>Do What The Fuck You Want To Public License </li></ul></ul>
  9. 9. Pros and Cons of Copyleft <ul><ul><li>Freeeeeedom to do whatever you want! </li></ul></ul><ul><ul><li>Freeeeeeee ($0) </li></ul></ul><ul><ul><li>Promotes innovation </li></ul></ul><ul><ul><li>Except make it proprietary </li></ul></ul><ul><ul><li>No money for me :( </li></ul></ul>
  10. 10. This report was brought to you by: Richard Kevin Lorenzana Grace Anne Agustin Leslie Anne Ng
  11. 11. Thank you! This video will now self-destruct!