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Software License Agreement

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

CKEditor - The text editor for Internet - https://ckeditor.com/

Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.

Licensed under the terms of any of the following licenses at your

choice:

 - GNU General Public License Version 2 or later (the "GPL")

   https://www.gnu.org/licenses/gpl.html

   (See Appendix A)

 - GNU Lesser General Public License Version 2.1 or later (the "LGPL")

   https://www.gnu.org/licenses/lgpl.html

   (See Appendix B)

 - Mozilla Public License Version 1.1 or later (the "MPL")

   https://www.mozilla.org/MPL/MPL-1.1.html

   (See Appendix C)

You are not required to, but if you want to explicitly declare the

license you have chosen to be bound to when using, reproducing,

modifying and distributing this software, just include a text file

titled "legal.txt" in your version of this software, indicating your

license choice. In any case, your choice will not restrict any

recipient of your version of this software to use, reproduce, modify

and distribute this software under any of the above licenses.

Sources of Intellectual Property Included in CKEditor

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

Where not otherwise indicated, all CKEditor content is authored by

CKSource engineers and consists of CKSource-owned intellectual

property. In some specific instances, CKEditor will incorporate work

done by developers outside of CKSource with their express permission.

The following libraries are included in CKEditor under the MIT license (see Appendix D):

* CKSource Samples Framework (included in the samples) - Copyright (c) 2014-2021, CKSource - Frederico Knabben.

* PicoModal (included in `samples/js/sf.js`) - Copyright (c) 2012 James Frasca.

* CodeMirror (included in the samples) - Copyright (C) 2014 by Marijn Haverbeke <marijnh@gmail.com> and others.

* ES6Promise - Copyright (c) 2014 Yehuda Katz, Tom Dale, Stefan Penner and contributors.

* A polyfill for `CSS.escape` (adopted with modifications in `core/tools.js`), Mathias Bynens, v1.5.1, https://mths.be/cssescape.

Parts of code taken from the following libraries are included in CKEditor under the MIT license (see Appendix D):

* jQuery (inspired the domReady function, ckeditor_base.js) - Copyright (c) 2011 John Resig, https://jquery.com/

The following libraries are included in CKEditor under the SIL Open Font License, Version 1.1 (see Appendix E):

* Font Awesome (included in the toolbar configurator) - Copyright (C) 2012 by Dave Gandy.

The following libraries are included in CKEditor under the BSD-3 License (see Appendix F):

* highlight.js (included in the `codesnippet` plugin) - Copyright (c) 2006, Ivan Sagalaev.

* YUI Library (included in the `uicolor` plugin) - Copyright (c) 2009, Yahoo! Inc.

Trademarks

----------

CKEditor is a trademark of CKSource - Frederico Knabben. All other brand

and product names are trademarks, registered trademarks or service

marks of their respective holders.

---

Appendix A: The GPL License

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

```

GNU GENERAL PUBLIC LICENSE

Version 2, June 1991

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

 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 Lesser 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

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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

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    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

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

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    customarily used for software interchange; or,

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    allowed only for noncommercial distribution and only if you

    received the program in object code or executable form with such

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

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If distribution of executable or object code is made by offering

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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

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

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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

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

You are not responsible for enforcing compliance by third parties to

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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

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

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integrity of the free software distribution system, which is

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generous contributions to the wide range of software distributed

through that system in reliance on consistent application of that

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to distribute software through any other system and a licensee cannot

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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

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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

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Foundation.

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

programs whose distribution conditions are different, write to the author

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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

```

Appendix B: The LGPL License

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

```

GNU LESSER GENERAL PUBLIC LICENSE

Version 2.1, February 1999

 Copyright (C) 1991, 1999 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.

[This is the first released version of the Lesser GPL.  It also counts

 as the successor of the GNU Library Public License, version 2, hence

 the version number 2.1.]

Preamble

  The licenses for most software are designed to take away your

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

Licenses are intended to guarantee your freedom to share and change

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

  This license, the Lesser General Public License, applies to some

specially designated software packages-typically libraries-of the

Free Software Foundation and other authors who decide to use it.  You

can use it too, but we suggest you first think carefully about whether

this license or the ordinary General Public License is the better

strategy to use in any particular case, based on the explanations below.

  When we speak of free software, we are referring to freedom of use,

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 and use pieces of

it in new free programs; and that you are informed that you can do

these things.

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

distributors to deny you these rights or to ask you to surrender these

rights.  These restrictions translate to certain responsibilities for

you if you distribute copies of the library or if you modify it.

  For example, if you distribute copies of the library, whether gratis

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

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

code.  If you link other code with the library, you must provide

complete object files to the recipients, so that they can relink them

with the library after making changes to the library and recompiling

it.  And you must show them these terms so they know their rights.

  We protect your rights with a two-step method: (1) we copyright the

library, and (2) we offer you this license, which gives you legal

permission to copy, distribute and/or modify the library.

  To protect each distributor, we want to make it very clear that

there is no warranty for the free library.  Also, if the library is

modified by someone else and passed on, the recipients should know

that what they have is not the original version, so that the original

author's reputation will not be affected by problems that might be

introduced by others.

  Finally, software patents pose a constant threat to the existence of

any free program.  We wish to make sure that a company cannot

effectively restrict the users of a free program by obtaining a

restrictive license from a patent holder.  Therefore, we insist that

any patent license obtained for a version of the library must be

consistent with the full freedom of use specified in this license.

  Most GNU software, including some libraries, is covered by the

ordinary GNU General Public License.  This license, the GNU Lesser

General Public License, applies to certain designated libraries, and

is quite different from the ordinary General Public License.  We use

this license for certain libraries in order to permit linking those

libraries into non-free programs.

  When a program is linked with a library, whether statically or using

a shared library, the combination of the two is legally speaking a

combined work, a derivative of the original library.  The ordinary

General Public License therefore permits such linking only if the

entire combination fits its criteria of freedom.  The Lesser General

Public License permits more lax criteria for linking other code with

the library.

  We call this license the "Lesser" General Public License because it

does Less to protect the user's freedom than the ordinary General

Public License.  It also provides other free software developers Less

of an advantage over competing non-free programs.  These disadvantages

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  In other cases, permission to use a particular library in non-free

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non-free programs enables many more people to use the whole GNU

operating system, as well as its variant, the GNU/Linux operating

system.

  Although the Lesser General Public License is Less protective of the

users' freedom, it does ensure that the user of a program that is

linked with the Library has the freedom and the wherewithal to run

that program using a modified version of the Library.

  The precise terms and conditions for copying, distribution and

modification follow.  Pay close attention to the difference between a

"work based on the library" and a "work that uses the library".  The

former contains code derived from the library, whereas the latter must

be combined with the library in order to run.

GNU LESSER GENERAL PUBLIC LICENSE

TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License Agreement applies to any software library or other

program which contains a notice placed by the copyright holder or

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  Activities other than copying, distribution and modification are not

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

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

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END OF TERMS AND CONDITIONS

```

Appendix C: The MPL License

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

```

MOZILLA PUBLIC LICENSE

Version 1.1

1. Definitions.

     1.0.1. "Commercial Use" means distribution or otherwise making the

     Covered Code available to a third party.

     1.1. "Contributor" means each entity that creates or contributes to

     the creation of Modifications.

     1.2. "Contributor Version" means the combination of the Original

     Code, prior Modifications used by a Contributor, and the Modifications

     made by that particular Contributor.

     1.3. "Covered Code" means the Original Code or Modifications or the

     combination of the Original Code and Modifications, in each case

     including portions thereof.

     1.4. "Electronic Distribution Mechanism" means a mechanism generally

     accepted in the software development community for the electronic

     transfer of data.

     1.5. "Executable" means Covered Code in any form other than Source

     Code.

     1.6. "Initial Developer" means the individual or entity identified

     as the Initial Developer in the Source Code notice required by Exhibit

     A.

     1.7. "Larger Work" means a work which combines Covered Code or

     portions thereof with code not governed by the terms of this License.

     1.8. "License" means this document.

     1.8.1. "Licensable" means having the right to grant, to the maximum

     extent possible, whether at the time of the initial grant or

     subsequently acquired, any and all of the rights conveyed herein.

     1.9. "Modifications" means any addition to or deletion from the

     substance or structure of either the Original Code or any previous

     Modifications. When Covered Code is released as a series of files, a

     Modification is:

          A. Any addition to or deletion from the contents of a file

          containing Original Code or previous Modifications.

          B. Any new file that contains any part of the Original Code or

          previous Modifications.

     1.10. "Original Code" means Source Code of computer software code

     which is described in the Source Code notice required by Exhibit A as

     Original Code, and which, at the time of its release under this

     License is not already Covered Code governed by this License.

     1.10.1. "Patent Claims" means any patent claim(s), now owned or

     hereafter acquired, including without limitation,  method, process,

     and apparatus claims, in any patent Licensable by grantor.

     1.11. "Source Code" means the preferred form of the Covered Code for

     making modifications to it, including all modules it contains, plus

     any associated interface definition files, scripts used to control

     compilation and installation of an Executable, or source code

     differential comparisons against either the Original Code or another

     well known, available Covered Code of the Contributor's choice. The

     Source Code can be in a compressed or archival form, provided the

     appropriate decompression or de-archiving software is widely available

     for no charge.

     1.12. "You" (or "Your")  means an individual or a legal entity

     exercising rights under, and complying with all of the terms of, this

     License or a future version of this License issued under Section 6.1.

     For legal entities, "You" includes any entity which controls, is

     controlled by, or is under common control with You. For purposes of

     this definition, "control" means (a) the power, direct or indirect,

     to cause the direction or management of such entity, whether by

     contract or otherwise, or (b) ownership of more than fifty percent

     (50%) of the outstanding shares or beneficial ownership of such

     entity.

2. Source Code License.

     2.1. The Initial Developer Grant.

     The Initial Developer hereby grants You a world-wide, royalty-free,

     non-exclusive license, subject to third party intellectual property

     claims:

          (a)  under intellectual property rights (other than patent or

          trademark) Licensable by Initial Developer to use, reproduce,

          modify, display, perform, sublicense and distribute the Original

          Code (or portions thereof) with or without Modifications, and/or

          as part of a Larger Work; and

          (b) under Patents Claims infringed by the making, using or

          selling of Original Code, to make, have made, use, practice,

          sell, and offer for sale, and/or otherwise dispose of the

          Original Code (or portions thereof).

          (c) the licenses granted in this Section 2.1(a) and (b) are

          effective on the date Initial Developer first distributes

          Original Code under the terms of this License.

          (d) Notwithstanding Section 2.1(b) above, no patent license is

          granted: 1) for code that You delete from the Original Code; 2)

          separate from the Original Code;  or 3) for infringements caused

          by: i) the modification of the Original Code or ii) the

          combination of the Original Code with other software or devices.

     2.2. Contributor Grant.

     Subject to third party intellectual property claims, each Contributor

     hereby grants You a world-wide, royalty-free, non-exclusive license

          (a)  under intellectual property rights (other than patent or

          trademark) Licensable by Contributor, to use, reproduce, modify,

          display, perform, sublicense and distribute the Modifications

          created by such Contributor (or portions thereof) either on an

          unmodified basis, with other Modifications, as Covered Code

          and/or as part of a Larger Work; and

          (b) under Patent Claims infringed by the making, using, or

          selling of  Modifications made by that Contributor either alone

          and/or in combination with its Contributor Version (or portions

          of such combination), to make, use, sell, offer for sale, have

          made, and/or otherwise dispose of: 1) Modifications made by that

          Contributor (or portions thereof); and 2) the combination of

          Modifications made by that Contributor with its Contributor

          Version (or portions of such combination).

          (c) the licenses granted in Sections 2.2(a) and 2.2(b) are

          effective on the date Contributor first makes Commercial Use of

          the Covered Code.

          (d)    Notwithstanding Section 2.2(b) above, no patent license is

          granted: 1) for any code that Contributor has deleted from the

          Contributor Version; 2)  separate from the Contributor Version;

          3)  for infringements caused by: i) third party modifications of

          Contributor Version or ii)  the combination of Modifications made

          by that Contributor with other software  (except as part of the

          Contributor Version) or other devices; or 4) under Patent Claims

          infringed by Covered Code in the absence of Modifications made by

          that Contributor.

3. Distribution Obligations.

     3.1. Application of License.

     The Modifications which You create or to which You contribute are

     governed by the terms of this License, including without limitation

     Section 2.2. The Source Code version of Covered Code may be

     distributed only under the terms of this License or a future version

     of this License released under Section 6.1, and You must include a

     copy of this License with every copy of the Source Code You

     distribute. You may not offer or impose any terms on any Source Code

     version that alters or restricts the applicable version of this

     License or the recipients' rights hereunder. However, You may include

     an additional document offering the additional rights described in

     Section 3.5.

     3.2. Availability of Source Code.

     Any Modification which You create or to which You contribute must be

     made available in Source Code form under the terms of this License

     either on the same media as an Executable version or via an accepted

     Electronic Distribution Mechanism to anyone to whom you made an

     Executable version available; and if made available via Electronic

     Distribution Mechanism, must remain available for at least twelve (12)

     months after the date it initially became available, or at least six

     (6) months after a subsequent version of that particular Modification

     has been made available to such recipients. You are responsible for

     ensuring that the Source Code version remains available even if the

     Electronic Distribution Mechanism is maintained by a third party.

     3.3. Description of Modifications.

     You must cause all Covered Code to which You contribute to contain a

     file documenting the changes You made to create that Covered Code and

     the date of any change. You must include a prominent statement that

     the Modification is derived, directly or indirectly, from Original

     Code provided by the Initial Developer and including the name of the

     Initial Developer in (a) the Source Code, and (b) in any notice in an

     Executable version or related documentation in which You describe the

     origin or ownership of the Covered Code.

     3.4. Intellectual Property Matters

          (a) Third Party Claims.

          If Contributor has knowledge that a license under a third party's

          intellectual property rights is required to exercise the rights

          granted by such Contributor under Sections 2.1 or 2.2,

          Contributor must include a text file with the Source Code

          distribution titled "LEGAL" which describes the claim and the

          party making the claim in sufficient detail that a recipient will

          know whom to contact. If Contributor obtains such knowledge after