Metacat

License

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                      GNU GENERAL PUBLIC LICENSE

                         Version 2, June 1991

   Copyright (C) 1989, 1991 Free Software Foundation, Inc.

                         59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

   Everyone is permitted to copy and distribute verbatim copies

   of this license document, but changing it is not allowed.

                              Preamble

    The licenses for most software are designed to take away your

  freedom to share and change it.  By contrast, the GNU General Public

  License is intended to guarantee your freedom to share and change free

  software--to make sure the software is free for all its users.  This

  General Public License applies to most of the Free Software

  Foundation's software and to any other program whose authors commit to

  using it.  (Some other Free Software Foundation software is covered by

  the GNU Library General Public License instead.)  You can apply it to

  your programs, too.

    When we speak of free software, we are referring to freedom, not

  price.  Our General Public Licenses are designed to make sure that you

  have the freedom to distribute copies of free software (and charge for

  this service if you wish), that you receive source code or can get it

  if you want it, that you can change the software or use pieces of it

  in new free programs; and that you know you can do these things.

    To protect your rights, we need to make restrictions that forbid

  anyone to deny you these rights or to ask you to surrender the rights.

  These restrictions translate to certain responsibilities for you if you

  distribute copies of the software, or if you modify it.

    For example, if you distribute copies of such a program, whether

  gratis or for a fee, you must give the recipients all the rights that

  you have.  You must make sure that they, too, receive or can get the

  source code.  And you must show them these terms so they know their

  rights.

    We protect your rights with two steps: (1) copyright the software, and

  (2) offer you this license which gives you legal permission to copy,

  distribute and/or modify the software.

    Also, for each author's protection and ours, we want to make certain

  that everyone understands that there is no warranty for this free

  software.  If the software is modified by someone else and passed on, we

  want its recipients to know that what they have is not the original, so

  that any problems introduced by others will not reflect on the original

  authors' reputations.

    Finally, any free program is threatened constantly by software

  patents.  We wish to avoid the danger that redistributors of a free

  program will individually obtain patent licenses, in effect making the

  program proprietary.  To prevent this, we have made it clear that any

  patent must be licensed for everyone's free use or not licensed at all.

    The precise terms and conditions for copying, distribution and

  modification follow.

                      GNU GENERAL PUBLIC LICENSE

     TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

    0. This License applies to any program or other work which contains

  a notice placed by the copyright holder saying it may be distributed

  under the terms of this General Public License.  The "Program", below,

  refers to any such program or work, and a "work based on the Program"

  means either the Program or any derivative work under copyright law:

  that is to say, a work containing the Program or a portion of it,

  either verbatim or with modifications and/or translated into another

  language.  (Hereinafter, translation is included without limitation in

  the term "modification".)  Each licensee is addressed as "you".

  Activities other than copying, distribution and modification are not

  covered by this License; they are outside its scope.  The act of

  running the Program is not restricted, and the output from the Program

  is covered only if its contents constitute a work based on the

  Program (independent of having been made by running the Program).

  Whether that is true depends on what the Program does.

    1. You may copy and distribute verbatim copies of the Program's

  source code as you receive it, in any medium, provided that you

  conspicuously and appropriately publish on each copy an appropriate

  copyright notice and disclaimer of warranty; keep intact all the

  notices that refer to this License and to the absence of any warranty;

  and give any other recipients of the Program a copy of this License

  along with the Program.

  You may charge a fee for the physical act of transferring a copy, and

  you may at your option offer warranty protection in exchange for a fee.

    2. You may modify your copy or copies of the Program or any portion

  of it, thus forming a work based on the Program, and copy and

  distribute such modifications or work under the terms of Section 1

  above, provided that you also meet all of these conditions:

      a) You must cause the modified files to carry prominent notices

      stating that you changed the files and the date of any change.

      b) You must cause any work that you distribute or publish, that in

      whole or in part contains or is derived from the Program or any

      part thereof, to be licensed as a whole at no charge to all third

      parties under the terms of this License.

      c) If the modified program normally reads commands interactively

      when run, you must cause it, when started running for such

      interactive use in the most ordinary way, to print or display an

      announcement including an appropriate copyright notice and a

      notice that there is no warranty (or else, saying that you provide

      a warranty) and that users may redistribute the program under

      these conditions, and telling the user how to view a copy of this

      License.  (Exception: if the Program itself is interactive but

      does not normally print such an announcement, your work based on

      the Program is not required to print an announcement.)

  These requirements apply to the modified work as a whole.  If

  identifiable sections of that work are not derived from the Program,

  and can be reasonably considered independent and separate works in

  themselves, then this License, and its terms, do not apply to those

  sections when you distribute them as separate works.  But when you

  distribute the same sections as part of a whole which is a work based

  on the Program, the distribution of the whole must be on the terms of

  this License, whose permissions for other licensees extend to the

  entire whole, and thus to each and every part regardless of who wrote it.

  Thus, it is not the intent of this section to claim rights or contest

  your rights to work written entirely by you; rather, the intent is to

  exercise the right to control the distribution of derivative or

  collective works based on the Program.

  In addition, mere aggregation of another work not based on the Program

  with the Program (or with a work based on the Program) on a volume of

  a storage or distribution medium does not bring the other work under

  the scope of this License.

    3. You may copy and distribute the Program (or a work based on it,

  under Section 2) in object code or executable form under the terms of

  Sections 1 and 2 above provided that you also do one of the following:

      a) Accompany it with the complete corresponding machine-readable

      source code, which must be distributed under the terms of Sections

      1 and 2 above on a medium customarily used for software interchange; or,

      b) Accompany it with a written offer, valid for at least three

      years, to give any third party, for a charge no more than your

      cost of physically performing source distribution, a complete

      machine-readable copy of the corresponding source code, to be

      distributed under the terms of Sections 1 and 2 above on a medium

      customarily used for software interchange; or,

      c) Accompany it with the information you received as to the offer

      to distribute corresponding source code.  (This alternative is

      allowed only for noncommercial distribution and only if you

      received the program in object code or executable form with such

      an offer, in accord with Subsection b above.)

  The source code for a work means the preferred form of the work for

  making modifications to it.  For an executable work, complete source

  code means all the source code for all modules it contains, plus any

  associated interface definition files, plus the scripts used to

  control compilation and installation of the executable.  However, as a

  special exception, the source code distributed need not include

  anything that is normally distributed (in either source or binary

  form) with the major components (compiler, kernel, and so on) of the

  operating system on which the executable runs, unless that component

  itself accompanies the executable.

  If distribution of executable or object code is made by offering

  access to copy from a designated place, then offering equivalent

  access to copy the source code from the same place counts as

  distribution of the source code, even though third parties are not

  compelled to copy the source along with the object code.

    4. You may not copy, modify, sublicense, or distribute the Program

  except as expressly provided under this License.  Any attempt

  otherwise to copy, modify, sublicense or distribute the Program is

  void, and will automatically terminate your rights under this License.

  However, parties who have received copies, or rights, from you under

  this License will not have their licenses terminated so long as such

  parties remain in full compliance.

    5. You are not required to accept this License, since you have not

  signed it.  However, nothing else grants you permission to modify or

  distribute the Program or its derivative works.  These actions are

  prohibited by law if you do not accept this License.  Therefore, by

  modifying or distributing the Program (or any work based on the

  Program), you indicate your acceptance of this License to do so, and

  all its terms and conditions for copying, distributing or modifying

  the Program or works based on it.

    6. Each time you redistribute the Program (or any work based on the

  Program), the recipient automatically receives a license from the

  original licensor to copy, distribute or modify the Program subject to

  these terms and conditions.  You may not impose any further

  restrictions on the recipients' exercise of the rights granted herein.

  You are not responsible for enforcing compliance by third parties to

  this License.

    7. If, as a consequence of a court judgment or allegation of patent

  infringement or for any other reason (not limited to patent issues),

  conditions are imposed on you (whether by court order, agreement or

  otherwise) that contradict the conditions of this License, they do not

  excuse you from the conditions of this License.  If you cannot

  distribute so as to satisfy simultaneously your obligations under this

  License and any other pertinent obligations, then as a consequence you

  may not distribute the Program at all.  For example, if a patent

  license would not permit royalty-free redistribution of the Program by

  all those who receive copies directly or indirectly through you, then

  the only way you could satisfy both it and this License would be to

  refrain entirely from distribution of the Program.

  If any portion of this section is held invalid or unenforceable under

  any particular circumstance, the balance of the section is intended to

  apply and the section as a whole is intended to apply in other

  circumstances.

  It is not the purpose of this section to induce you to infringe any

  patents or other property right claims or to contest validity of any

  such claims; this section has the sole purpose of protecting the

  integrity of the free software distribution system, which is

  implemented by public license practices.  Many people have made

  generous contributions to the wide range of software distributed

  through that system in reliance on consistent application of that

  system; it is up to the author/donor to decide if he or she is willing

  to distribute software through any other system and a licensee cannot

  impose that choice.

  This section is intended to make thoroughly clear what is believed to

  be a consequence of the rest of this License.

    8. If the distribution and/or use of the Program is restricted in

  certain countries either by patents or by copyrighted interfaces, the

  original copyright holder who places the Program under this License

  may add an explicit geographical distribution limitation excluding

  those countries, so that distribution is permitted only in or among

  countries not thus excluded.  In such case, this License incorporates

  the limitation as if written in the body of this License.

    9. The Free Software Foundation may publish revised and/or new versions

  of the General Public License from time to time.  Such new versions will

  be similar in spirit to the present version, but may differ in detail to

  address new problems or concerns.

  Each version is given a distinguishing version number.  If the Program

  specifies a version number of this License which applies to it and "any

  later version", you have the option of following the terms and conditions

  either of that version or of any later version published by the Free

  Software Foundation.  If the Program does not specify a version number of

  this License, you may choose any version ever published by the Free Software

  Foundation.

    10. If you wish to incorporate parts of the Program into other free

  programs whose distribution conditions are different, write to the author

  to ask for permission.  For software which is copyrighted by the Free

  Software Foundation, write to the Free Software Foundation; we sometimes

  make exceptions for this.  Our decision will be guided by the two goals

  of preserving the free status of all derivatives of our free software and

  of promoting the sharing and reuse of software generally.

                              NO WARRANTY

    11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY

  FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN

  OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES

  PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED

  OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS

  TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE

  PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,

  REPAIR OR CORRECTION.

    12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING

  WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR

  REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,

  INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING

  OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED

  TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY

  YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER

  PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE

  POSSIBILITY OF SUCH DAMAGES.

                       END OF TERMS AND CONDITIONS

              How to Apply These Terms to Your New Programs

    If you develop a new program, and you want it to be of the greatest

  possible use to the public, the best way to achieve this is to make it

  free software which everyone can redistribute and change under these terms.

    To do so, attach the following notices to the program.  It is safest

  to attach them to the start of each source file to most effectively

  convey the exclusion of warranty; and each file should have at least

  the "copyright" line and a pointer to where the full notice is found.

      <one line to give the program's name and a brief idea of what it does.>

      Copyright (C) <year>  <name of author>

      This program is free software; you can redistribute it and/or modify

      it under the terms of the GNU General Public License as published by

      the Free Software Foundation; either version 2 of the License, or

      (at your option) any later version.

      This program is distributed in the hope that it will be useful,

      but WITHOUT ANY WARRANTY; without even the implied warranty of

      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

      GNU General Public License for more details.

      You should have received a copy of the GNU General Public License

      along with this program; if not, write to the Free Software

      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  Also add information on how to contact you by electronic and paper mail.

  If the program is interactive, make it output a short notice like this

  when it starts in an interactive mode:

      Gnomovision version 69, Copyright (C) year name of author

      Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.

      This is free software, and you are welcome to redistribute it

      under certain conditions; type `show c' for details.

  The hypothetical commands `show w' and `show c' should show the appropriate

  parts of the General Public License.  Of course, the commands you use may

  be called something other than `show w' and `show c'; they could even be

  mouse-clicks or menu items--whatever suits your program.

  You should also get your employer (if you work as a programmer) or your

  school, if any, to sign a "copyright disclaimer" for the program, if

  necessary.  Here is a sample; alter the names:

    Yoyodyne, Inc., hereby disclaims all copyright interest in the program

    `Gnomovision' (which makes passes at compilers) written by James Hacker.

    <signature of Ty Coon>, 1 April 1989

    Ty Coon, President of Vice

  This General Public License does not permit incorporating your program into

  proprietary programs.  If your program is a subroutine library, you may

  consider it more useful to permit linking proprietary applications with the

  library.  If this is what you want to do, use the GNU Library General

  Public License instead of this License.

By default, Metacat supports the use of LDAP as an external authentication

mechanism.  It does this by supplying a class (``AuthLDAP``) that implements

authentication via an external LDAP server.  However, administrators have the 

choice of replacing LDAP with a different system for authentication because 

Metacat is written such that this Authentication provider is replaceable with 

another class that implements the same interface (``AuthInterface``). As

an Administrator, you have the choice to provide an alternative implementation

of ``AuthInterface`` and then configuring ``metacat.properties`` to use that

class for authentication instead of LDAP.

   license