# Copyright

    Copyright (c) 2002-2004
    Ben Collins-Sussman, Brian W. Fitzpatrick, C. Michael Pilato.

    This work is licensed under the Creative Commons Attribution License.
    To view a copy of this license, visit
    http://creativecommons.org/licenses/by/2.0/ or send a letter to
    Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305,
    USA.

    A summary of the license is given below, followed by the full legal
    text.

    --------------------------------------------------------------------

    You are free:

        * to copy, distribute, display, and perform the work
        * to make derivative works
        * to make commercial use of the work

    Under the following conditions:

    Attribution. You must give the original author credit.

        * For any reuse or distribution, you must make clear to others the
          license terms of this work.

        * Any of these conditions can be waived if you get permission from
          the author.

    Your fair use and other rights are in no way affected by the above.

    The above is a summary of the full license below.

    ====================================================================

    Creative Commons Legal Code
    Attribution 2.0

    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
    LEGAL SERVICES. DISTRIBUTION OF THIS LICENSE DOES NOT CREATE AN
    ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
    INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
    REGARDING THE INFORMATION PROVIDED, AND DISCLAIMS LIABILITY FOR
    DAMAGES RESULTING FROM ITS USE.

    License

    THE WORK (AS DEFINED BELOW) IS PROVIDED UNDER THE TERMS OF THIS
    CREATIVE COMMONS PUBLIC LICENSE ("CCPL" OR "LICENSE"). THE WORK IS
    PROTECTED BY COPYRIGHT AND/OR OTHER APPLICABLE LAW. ANY USE OF THE
    WORK OTHER THAN AS AUTHORIZED UNDER THIS LICENSE OR COPYRIGHT LAW IS
    PROHIBITED.

    BY EXERCISING ANY RIGHTS TO THE WORK PROVIDED HERE, YOU ACCEPT AND
    AGREE TO BE BOUND BY THE TERMS OF THIS LICENSE. THE LICENSOR GRANTS
    YOU THE RIGHTS CONTAINED HERE IN CONSIDERATION OF YOUR ACCEPTANCE OF
    SUCH TERMS AND CONDITIONS.

    1. Definitions

       a. "Collective Work" means a work, such as a periodical issue,
          anthology or encyclopedia, in which the Work in its entirety in
          unmodified form, along with a number of other contributions,
          constituting separate and independent works in themselves, are
          assembled into a collective whole. A work that constitutes a
          Collective Work will not be considered a Derivative Work (as
          defined below) for the purposes of this License.

       b. "Derivative Work" means a work based upon the Work or upon the
          Work and other pre-existing works, such as a translation,
          musical arrangement, dramatization, fictionalization, motion
          picture version, sound recording, art reproduction, abridgment,
          condensation, or any other form in which the Work may be recast,
          transformed, or adapted, except that a work that constitutes a
          Collective Work will not be considered a Derivative Work for the
          purpose of this License. For the avoidance of doubt, where the
          Work is a musical composition or sound recording, the
          synchronization of the Work in timed-relation with a moving
          image ("synching") will be considered a Derivative Work for the
          purpose of this License.

       c. "Licensor" means the individual or entity that offers the Work
          under the terms of this License.

       d. "Original Author" means the individual or entity who created the Work.

       e. "Work" means the copyrightable work of authorship offered under
          the terms of this License.

       f. "You" means an individual or entity exercising rights under this
          License who has not previously violated the terms of this
          License with respect to the Work, or who has received express
          permission from the Licensor to exercise rights under this
          License despite a previous violation.

    2. Fair Use Rights. Nothing in this license is intended to reduce,
       limit, or restrict any rights arising from fair use, first sale or
       other limitations on the exclusive rights of the copyright owner
       under copyright law or other applicable laws.

    3. License Grant. Subject to the terms and conditions of this License,
       Licensor hereby grants You a worldwide, royalty-free,
       non-exclusive, perpetual (for the duration of the applicable
       copyright) license to exercise the rights in the Work as stated
       below:

       a. to reproduce the Work, to incorporate the Work into one or more
          Collective Works, and to reproduce the Work as incorporated in
          the Collective Works;

       b. to create and reproduce Derivative Works;

       c. to distribute copies or phonorecords of, display publicly,
          perform publicly, and perform publicly by means of a digital
          audio transmission the Work including as incorporated in
          Collective Works;

       d. to distribute copies or phonorecords of, display publicly,
          perform publicly, and perform publicly by means of a digital
          audio transmission Derivative Works.

       e.

          For the avoidance of doubt, where the work is a musical composition:

             i. Performance Royalties Under Blanket Licenses. Licensor
                waives the exclusive right to collect, whether
                individually or via a performance rights society
                (e.g. ASCAP, BMI, SESAC), royalties for the public
                performance or public digital performance (e.g. webcast)
                of the Work.

            ii. Mechanical Rights and Statutory Royalties. Licensor waives
                the exclusive right to collect, whether individually or
                via a music rights agency or designated agent (e.g. Harry
                Fox Agency), royalties for any phonorecord You create from
                the Work ("cover version") and distribute, subject to the
                compulsory license created by 17 USC Section 115 of the US
                Copyright Act (or the equivalent in other jurisdictions).

       f. Webcasting Rights and Statutory Royalties. For the avoidance of
          doubt, where the Work is a sound recording, Licensor waives the
          exclusive right to collect, whether individually or via a
          performance-rights society (e.g. SoundExchange), royalties for
          the public digital performance (e.g. webcast) of the Work,
          subject to the compulsory license created by 17 USC Section 114
          of the US Copyright Act (or the equivalent in other
          jurisdictions).

    The above rights may be exercised in all media and formats whether now
    known or hereafter devised. The above rights include the right to make
    such modifications as are technically necessary to exercise the rights
    in other media and formats. All rights not expressly granted by
    Licensor are hereby reserved.

    4. Restrictions.The license granted in Section 3 above is expressly
       made subject to and limited by the following restrictions:

       a. You may distribute, publicly display, publicly perform, or
          publicly digitally perform the Work only under the terms of this
          License, and You must include a copy of, or the Uniform Resource
          Identifier for, this License with every copy or phonorecord of
          the Work You distribute, publicly display, publicly perform, or
          publicly digitally perform. You may not offer or impose any
          terms on the Work that alter or restrict the terms of this
          License or the recipients' exercise of the rights granted
          hereunder. You may not sublicense the Work. You must keep intact
          all notices that refer to this License and to the disclaimer of
          warranties. You may not distribute, publicly display, publicly
          perform, or publicly digitally perform the Work with any
          technological measures that control access or use of the Work in
          a manner inconsistent with the terms of this License
          Agreement. The above applies to the Work as incorporated in a
          Collective Work, but this does not require the Collective Work
          apart from the Work itself to be made subject to the terms of
          this License. If You create a Collective Work, upon notice from
          any Licensor You must, to the extent practicable, remove from
          the Collective Work any reference to such Licensor or the
          Original Author, as requested. If You create a Derivative Work,
          upon notice from any Licensor You must, to the extent
          practicable, remove from the Derivative Work any reference to
          such Licensor or the Original Author, as requested.

       b. If you distribute, publicly display, publicly perform, or
          publicly digitally perform the Work or any Derivative Works or
          Collective Works, You must keep intact all copyright notices for
          the Work and give the Original Author credit reasonable to the
          medium or means You are utilizing by conveying the name (or
          pseudonym if applicable) of the Original Author if supplied; the
          title of the Work if supplied; to the extent reasonably
          practicable, the Uniform Resource Identifier, if any, that
          Licensor specifies to be associated with the Work, unless such
          URI does not refer to the copyright notice or licensing
          information for the Work; and in the case of a Derivative Work,
          a credit identifying the use of the Work in the Derivative Work
          (e.g., "French translation of the Work by Original Author," or
          "Screenplay based on original Work by Original Author"). Such
          credit may be implemented in any reasonable manner; provided,
          however, that in the case of a Derivative Work or Collective
          Work, at a minimum such credit will appear where any other
          comparable authorship credit appears and in a manner at least as
          prominent as such other comparable authorship credit.

    5. Representations, Warranties and Disclaimer

    UNLESS OTHERWISE MUTUALLY AGREED TO BY THE PARTIES IN WRITING,
    LICENSOR OFFERS THE WORK AS-IS AND MAKES NO REPRESENTATIONS OR
    WARRANTIES OF ANY KIND CONCERNING THE WORK, EXPRESS, IMPLIED,
    STATUTORY OR OTHERWISE, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF
    TITLE, MERCHANTIBILITY, FITNESS FOR A PARTICULAR PURPOSE,
    NONINFRINGEMENT, OR THE ABSENCE OF LATENT OR OTHER DEFECTS, ACCURACY,
    OR THE PRESENCE OF ABSENCE OF ERRORS, WHETHER OR NOT
    DISCOVERABLE. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF IMPLIED
    WARRANTIES, SO SUCH EXCLUSION MAY NOT APPLY TO YOU.

    6. Limitation on Liability. EXCEPT TO THE EXTENT REQUIRED BY
       APPLICABLE LAW, IN NO EVENT WILL LICENSOR BE LIABLE TO YOU ON ANY
       LEGAL THEORY FOR ANY SPECIAL, INCIDENTAL, CONSEQUENTIAL, PUNITIVE
       OR EXEMPLARY DAMAGES ARISING OUT OF THIS LICENSE OR THE USE OF THE
       WORK, EVEN IF LICENSOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
       DAMAGES.

    7. Termination

       a. This License and the rights granted hereunder will terminate
          automatically upon any breach by You of the terms of this
          License. Individuals or entities who have received Derivative
          Works or Collective Works from You under this License, however,
          will not have their licenses terminated provided such
          individuals or entities remain in full compliance with those
          licenses. Sections 1, 2, 5, 6, 7, and 8 will survive any
          termination of this License.

       b. Subject to the above terms and conditions, the license granted
          here is perpetual (for the duration of the applicable copyright
          in the Work). Notwithstanding the above, Licensor reserves the
          right to release the Work under different license terms or to
          stop distributing the Work at any time; provided, however that
          any such election will not serve to withdraw this License (or
          any other license that has been, or is required to be, granted
          under the terms of this License), and this License will continue
          in full force and effect unless terminated as stated above.

    8. Miscellaneous

       a. Each time You distribute or publicly digitally perform the Work
          or a Collective Work, the Licensor offers to the recipient a
          license to the Work on the same terms and conditions as the
          license granted to You under this License.

       b. Each time You distribute or publicly digitally perform a
          Derivative Work, Licensor offers to the recipient a license to
          the original Work on the same terms and conditions as the
          license granted to You under this License.

       c. If any provision of this License is invalid or unenforceable
          under applicable law, it shall not affect the validity or
          enforceability of the remainder of the terms of this License,
          and without further action by the parties to this agreement,
          such provision shall be reformed to the minimum extent necessary
          to make such provision valid and enforceable.

       d. No term or provision of this License shall be deemed waived and
          no breach consented to unless such waiver or consent shall be in
          writing and signed by the party to be charged with such waiver
          or consent.

       e. This License constitutes the entire agreement between the
          parties with respect to the Work licensed here. There are no
          understandings, agreements or representations with respect to
          the Work not specified here. Licensor shall not be bound by any
          additional provisions that may appear in any communication from
          You. This License may not be modified without the mutual written
          agreement of the Licensor and You.

    Creative Commons is not a party to this License, and makes no warranty
    whatsoever in connection with the Work. Creative Commons will not be
    liable to You or any party on any legal theory for any damages
    whatsoever, including without limitation any general, special,
    incidental or consequential damages arising in connection to this
    license. Notwithstanding the foregoing two (2) sentences, if Creative
    Commons has expressly identified itself as the Licensor hereunder, it
    shall have all rights and obligations of Licensor.

    Except for the limited purpose of indicating to the public that the
    Work is licensed under the CCPL, neither party will use the trademark
    "Creative Commons" or any related trademark or logo of Creative
    Commons without the prior written consent of Creative Commons. Any
    permitted use will be in compliance with Creative Commons'
    then-current trademark usage guidelines, as may be published on its
    website or otherwise made available upon request from time to time.

    Creative Commons may be contacted at http://creativecommons.org/.

    ====================================================================