license.txt

BitTorrent（简称BT

BitTorrent Open Source License

Version 1.0

This BitTorrent Open Source License (the "License") applies to the BitTorrent client and related software products as well as any updates or maintenance releases of that software ("BitTorrent Products") that are distributed by BitTorrent, Inc. ("Licensor").  Any BitTorrent Product licensed pursuant to this License is a Licensed Product.  Licensed Product, in its entirety, is protected by U.S. copyright law.  This License identifies the terms under which you may use, copy, distribute or modify Licensed Product. 

Preamble

This Preamble is intended to describe, in plain English, the nature and scope of this License.  However, this Preamble is not a part of this license.  The legal effect of this License is dependent only upon the terms of the License and not this Preamble.

This License complies with the Open Source Definition and is derived from the Jabber Open Source License 1.0 (the "JOSL"), which has been approved by Open Source Initiative. Sections 4(c) and 4(f)(iii) from the JOSL have been dropped.

This License provides that:

1.      You may use, sell or give away the Licensed Product, alone or as a component of an aggregate software distribution containing programs from several different sources.  No royalty or other fee is required.

2.      Both Source Code and executable versions of the Licensed Product, including Modifications made by previous Contributors, are available for your use.  (The terms "Licensed Product," "Modifications," "Contributors" and "Source Code" are defined in the License.)

3.      You are allowed to make Modifications to the Licensed Product, and you can create Derivative Works from it. (The term "Derivative Works" is defined in the License.)

4.      By accepting the Licensed Product under the provisions of this License, you agree that any Modifications you make to the Licensed Product and then distribute are governed by the provisions of this License.  In particular, you must make the Source Code of your Modifications available to others.

5.      You may use the Licensed Product for any purpose, but the Licensor is not providing you any warranty whatsoever, nor is the Licensor accepting any liability in the event that the Licensed Product doesn't work properly or causes you any injury or damages.

6.      If you sublicense the Licensed Product or Derivative Works, you may charge fees for warranty or support, or for accepting indemnity or liability obligations to your customers.  You cannot charge for the Source Code.

7.      If you assert any patent claims against the Licensor relating to the Licensed Product, or if you breach any terms of the License, your rights to the Licensed Product under this License automatically terminate.

You may use this License to distribute your own Derivative Works, in which case the provisions of this License will apply to your Derivative Works just as they do to the original Licensed Product.

Alternatively, you may distribute your Derivative Works under any other OSI-approved Open Source license, or under a proprietary license of your choice.  If you use any license other than this License, however, you must continue to fulfill the requirements of this License (including the provisions relating to publishing the Source Code) for those portions of your Derivative Works that consist of the Licensed Product, including the files containing Modifications.

New versions of this License may be published from time to time.  You may choose to  continue to use the license terms in this version of the License or those from the new version.  However, only the Licensor has the right to change the License terms as they apply to the Licensed Product. 

This License relies on precise definitions for certain terms.  Those terms are defined when they are first used, and the definitions are repeated for your convenience in a Glossary at the end of the License.


License Terms

1.      Grant of License From Licensor.  Licensor hereby grants you a world-wide, royalty-free, non-exclusive license, subject to third party intellectual property claims, to do the following:

a.       Use, reproduce, modify, display, perform, sublicense and distribute any Modifications created by such Contributor or portions thereof, in both Source Code or as an executable program, either on an unmodified basis or as part of Derivative Works.

b.       Under claims of patents now or hereafter owned or controlled by Contributor, to make, use, sell, offer for sale, have made, and/or otherwise dispose of Modifications or portions thereof, but solely to the extent that any such claim is necessary to enable you to make, use, sell, offer for sale, have made, and/or otherwise dispose of Modifications or portions thereof or Derivative Works thereof.


2. Grant of License to Modifications From Contributor. "Modifications" means any additions to or deletions from the substance or structure of (i) a file containing Licensed Product, or (ii) any new file that contains any part of Licensed Product. Hereinafter in this License, the term "Licensed Product" shall include all previous Modifications that you receive from any Contributor. By application of the provisions in Section 4(a) below, each person or entity who created or contributed to the creation of, and distributed, a Modification (a "Contributor") hereby grants you a world-wide, royalty-free, non-exclusive license, subject to third party intellectual property claims, to do the following:

   1. Use, reproduce, modify, display, perform, sublicense and distribute any Modifications created by such Contributor or portions thereof, in both Source Code or as an executable program, either on an unmodified basis or as part of Derivative Works.

   2. Under claims of patents now or hereafter owned or controlled by Contributor, to make, use, sell, offer for sale, have made, and/or otherwise dispose of Modifications or portions thereof, but solely to the extent that any such claim is necessary to enable you to make, use, sell, offer for sale, have made, and/or otherwise dispose of Modifications or portions thereof or Derivative Works thereof. 


3.      Exclusions From License Grant.  Nothing in this License shall be deemed to grant any rights to trademarks, copyrights, patents, trade secrets or any other intellectual property of Licensor or any Contributor except as expressly stated herein. No patent license is granted separate from the Licensed Product, for code that you delete from the Licensed Product, or for combinations of the Licensed Product with other software or hardware.  No right is granted to the trademarks of Licensor or any Contributor even if such marks are included in the Licensed Product.  Nothing in this License shall be interpreted to prohibit Licensor from licensing under different terms from this License any code that Licensor otherwise would have a right to license.


4.      Your Obligations Regarding Distribution. 

a.       Application of This License to Your Modifications.  As an express condition for your use of the Licensed Product, you hereby agree that any Modifications that you create or to which you contribute, and which you distribute, are governed by the terms of this License including, without limitation, Section 2.  Any Modifications that you create or to which you contribute may be distributed only under the terms of this License or a future version of this License released under Section 7.  You must include a copy of this License with every copy of the Modifications you distribute.  You agree not to offer or impose any terms on any Source Code or executable version of the Licensed Product or Modifications that alter or restrict 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 4(d).

b.       Availability of Source Code.  You must make available, under the terms of this License, the Source Code of the Licensed Product and any Modifications that you distribute, either on the same media as you distribute any executable or other form of the Licensed Product, or via a mechanism generally accepted in the software development community for the electronic transfer of data (an "Electronic Distribution Mechanism").  The Source Code for any version of Licensed Product or Modifications that you distribute 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 said Licensed Product or Modifications has been made available.  You are responsible for ensuring that the Source Code version remains available even if the Electronic Distribution Mechanism is maintained by a third party.

c.       Intellectual Property Matters.  

                                i.            Third Party Claims.  If you have knowledge that a license to a third party's intellectual property right is required to exercise the rights granted by this License, you must include a text file with the Source Code distribution titled "LEGAL" that describes the claim and the party making the claim in sufficient detail that a recipient will know whom to contact.  If you obtain such knowledge after you make any Modifications available as described in Section 4(b), you shall promptly modify the LEGAL file in all copies you make available thereafter and shall take other steps (such as notifying appropriate mailing lists or newsgroups) reasonably calculated to inform those who received the Licensed Product from you that new knowledge has been obtained.

                               ii.            Contributor APIs.  If your Modifications include an application programming interface ("API") and you have knowledge of patent licenses that are reasonably necessary to implement that API, you must also include this information in the LEGAL file.

                              iii.            Representations.  You represent that, except as disclosed pursuant to 4(c)(i) above, you believe that any Modifications you distribute are your original creations and that you have sufficient rights to grant the rights conveyed by this License.

d.       Required Notices.  You must duplicate this License in any documentation you provide along with the Source Code of any Modifications you create or to which you contribute, and which you distribute, wherever you describe recipients' rights relating to Licensed Product.  You must duplicate the notice contained in Exhibit A (the "Notice") in each file of the Source Code of any copy you distribute of the Licensed Product. If you created a Modification, you may add your name as a Contributor to the Notice.  If it is not possible to put the Notice in a particular Source Code file due to its structure, then you must include such Notice in a location (such as a relevant directory file) where a user would be likely to look for such a notice.  You may choose to offer, and charge a fee for, warranty, support, indemnity or liability obligations to one or more recipients of Licensed Product. However, you may do so only on your own behalf, and not on behalf of the Licensor or any Contributor.  You must make it clear that any such warranty, support, indemnity or liability obligation is offered by you alone, and you hereby agree to indemnify the Licensor and every Contributor for any liability incurred by the Licensor or such Contributor as a result of warranty, support, indemnity or liability terms you offer.

e.        Distribution of Executable Versions.  You may distribute Licensed Product as an executable program under a license of your choice that may contain terms different from this License provided (i) you have satisfied the requirements of Sections 4(a) through 4(d) for that distribution, (ii) you include a conspicuous notice in the executable version, related documentation and collateral materials stating that the Source Code version of the Licensed Product is available under the terms of this License, including a description of how and where you have fulfilled the obligations of Section 4(b), and (iii) you make it clear that any terms that differ from this License are offered by you alone, not by Licensor or any Contributor.  You hereby agree to indemnify the Licensor and every Contributor for any liability incurred by Licensor or such Contributor as a result of any terms you offer. 

f.       Distribution of Derivative Works.  You may create Derivative Works (e.g., combinations of some or all of the Licensed Product with other code) and distribute the Derivative Works as products under any other license you select, with the proviso that the requirements of this License are fulfilled for those portions of the Derivative Works that consist of the Licensed Product or any Modifications thereto.