Genre: Legal

GNU GENERAL PUBLIC LICENSE Version 3 , 29 June 2007 Copyright © 2007 Free Software Foundation , Inc. < http://fsf.org/ > Everyone is permitted to copy and distribute verbatim copies of this license document , but changing it is not allowed . Preamble The GNU General Public License is a free , copyleft license for software and other kinds of works . The licenses for most software and other practical works are designed to take away your freedom to share and change the works . By contrast , the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users . We , the Free Software Foundation , use the GNU General Public License for most of our software ; it applies also to any other work released this way by its authors . 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 them 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 prevent others from denying you these rights or asking you to surrender the rights . Therefore , you have certain responsibilities if you distribute copies of the software , or if you modify it : responsibilities to respect the freedom of others . For example , if you distribute copies of such a program , whether gratis or for a fee , you must pass on to the recipients the same freedoms that you received . 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 . Developers that use the GNU GPL protect your rights with two steps : ( 1 ) assert copyright on the software , and ( 2 ) offer you this License giving you legal permission to copy , distribute and / or modify it . For the developers ' and authors' protection , the GPL clearly explains that there is no warranty for this free software . For both users ' and authors' sake , the GPL requires that modified versions be marked as changed , so that their problems will not be attributed erroneously to authors of previous versions . Some devices are designed to deny users access to install or run modified versions of the software inside them , although the manufacturer can do so . This is fundamentally incompatible with the aim of protecting users' freedom to change the software . The systematic pattern of such abuse occurs in the area of products for individuals to use , which is precisely where it is most unacceptable . Therefore , we have designed this version of the GPL to prohibit the practice for those products . If such problems arise substantially in other domains , we stand ready to extend this provision to those domains in future versions of the GPL , as needed to protect the freedom of users . Finally , every program is threatened constantly by software patents . States should not allow patents to restrict development and use of software on general-purpose computers , but in those that do , we wish to avoid the special danger that patents applied to a free program could make it effectively proprietary . To prevent this , the GPL assures that patents can not be used to render the program non-free . The precise terms and conditions for copying , distribution and modification follow . TERMS AND CONDITIONS 0 . Definitions . " This License " refers to version 3 of the GNU General Public License . " Copyright " also means copyright-like laws that apply to other kinds of works , such as semiconductor masks . " The Program " refers to any copyrightable work licensed under this License . Each licensee is addressed as " you " . " Licensees " and " recipients " may be individuals or organizations . To " modify " a work means to copy from or adapt all or part of the work in a fashion requiring copyright permission , other than the making of an exact copy . The resulting work is called a " modified version " of the earlier work or a work " based on " the earlier work . A " covered work " means either the unmodified Program or a work based on the Program . To " propagate " a work means to do anything with it that , without permission , would make you directly or secondarily liable for infringement under applicable copyright law , except executing it on a computer or modifying a private copy . Propagation includes copying , distribution ( with or without modification ) , making available to the public , and in some countries other activities as well . To " convey " a work means any kind of propagation that enables other parties to make or receive copies . Mere interaction with a user through a computer network , with no transfer of a copy , is not conveying . An interactive user interface displays " Appropriate Legal Notices " to the extent that it includes a convenient and prominently visible feature that ( 1 ) displays an appropriate copyright notice , and ( 2 ) tells the user that there is no warranty for the work ( except to the extent that warranties are provided ) , that licensees may convey the work under this License , and how to view a copy of this License . If the interface presents a list of user commands or options , such as a menu , a prominent item in the list meets this criterion . 1 . Source Code . The " source code " for a work means the preferred form of the work for making modifications to it . " Object code " means any non-source form of a work . A " Standard Interface " means an interface that either is an official standard defined by a recognized standards body , or , in the case of interfaces specified for a particular programming language , one that is widely used among developers working in that language . The " System Libraries " of an executable work include anything , other than the work as a whole , that ( a ) is included in the normal form of packaging a Major Component , but which is not part of that Major Component , and ( b ) serves only to enable use of the work with that Major Component , or to implement a Standard Interface for which an implementation is available to the public in source code form . A " Major Component " , in this context , means a major essential component ( kernel , window system , and so on ) of the specific operating system ( if any ) on which the executable work runs , or a compiler used to produce the work , or an object code interpreter used to run it . The " Corresponding Source " for a work in object code form means all the source code needed to generate , install , and ( for an executable work ) run the object code and to modify the work , including scripts to control those activities . However , it does not include the work's System Libraries , or general-purpose tools or generally available free programs which are used unmodified in performing those activities but which are not part of the work . For example , Corresponding Source includes interface definition files associated with source files for the work , and the source code for shared libraries and dynamically linked subprograms that the work is specifically designed to require , such as by intimate data communication or control flow between those subprograms and other parts of the work . The Corresponding Source need not include anything that users can regenerate automatically from other parts of the Corresponding Source . The Corresponding Source for a work in source code form is that same work . 2 . Basic Permissions . All rights granted under this License are granted for the term of copyright on the Program , and are irrevocable provided the stated conditions are met . This License explicitly affirms your unlimited permission to run the unmodified Program . The output from running a covered work is covered by this License only if the output , given its content , constitutes a covered work . This License acknowledges your rights of fair use or other equivalent , as provided by copyright law . You may make , run and propagate covered works that you do not convey , without conditions so long as your license otherwise remains in force . You may convey covered works to others for the sole purpose of having them make modifications exclusively for you , or provide you with facilities for running those works , provided that you comply with the terms of this License in conveying all material for which you do not control copyright . Those thus making or running the covered works for you must do so exclusively on your behalf , under your direction and control , on terms that prohibit them from making any copies of your copyrighted material outside their relationship with you . Conveying under any other circumstances is permitted solely under the conditions stated below . Sublicensing is not allowed ; section 10 makes it unnecessary . 3 . Protecting Users' Legal Rights From Anti-Circumvention Law . No covered work shall be deemed part of an effective technological measure under any applicable law fulfilling obligations under article 11 of the WIPO copyright treaty adopted on 20 December 1996 , or similar laws prohibiting or restricting circumvention of such measures . When you convey a covered work , you waive any legal power to forbid circumvention of technological measures to the extent such circumvention is effected by exercising rights under this License with respect to the covered work , and you disclaim any intention to limit operation or modification of the work as a means of enforcing , against the work's users , your or third parties' legal rights to forbid circumvention of technological measures . 4 . Conveying Verbatim Copies . You may convey 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 ; keep intact all notices stating that this License and any non-permissive terms added in accord with section 7 apply to the code ; keep intact all notices of the absence of any warranty ; and give all recipients a copy of this License along with the Program . You may charge any price or no price for each copy that you convey , and you may offer support or warranty protection for a fee . 5 . Conveying Modified Source Versions . You may convey a work based on the Program , or the modifications to produce it from the Program , in the form of source code under the terms of section 4 , provided that you also meet all of these conditions : a ) The work must carry prominent notices stating that you modified it , and giving a relevant date . b ) The work must carry prominent notices stating that it is released under this License and any conditions added under section 7 . This requirement modifies the requirement in section 4 to " keep intact all notices " . c ) You must license the entire work , as a whole , under this License to anyone who comes into possession of a copy . This License will therefore apply , along with any applicable section 7 additional terms , to the whole of the work , and all its parts , regardless of how they are packaged . This License gives no permission to license the work in any other way , but it does not invalidate such permission if you have separately received it . d ) If the work has interactive user interfaces , each must display Appropriate Legal Notices ; however , if the Program has interactive interfaces that do not display Appropriate Legal Notices , your work need not make them do so . A compilation of a covered work with other separate and independent works , which are not by their nature extensions of the covered work , and which are not combined with it such as to form a larger program , in or on a volume of a storage or distribution medium , is called an " aggregate " if the compilation and its resulting copyright are not used to limit the access or legal rights of the compilation's users beyond what the individual works permit . Inclusion of a covered work in an aggregate does not cause this License to apply to the other parts of the aggregate . 6 . Conveying Non-Source Forms . You may convey a covered work in object code form under the terms of sections 4 and 5 , provided that you also convey the machine-readable Corresponding Source under the terms of this License , in one of these ways : a ) Convey the object code in , or embodied in , a physical product ( including a physical distribution medium ) , accompanied by the Corresponding Source fixed on a durable physical medium customarily used for software interchange . b ) Convey the object code in , or embodied in , a physical product ( including a physical distribution medium ) , accompanied by a written offer , valid for at least three years and valid for as long as you offer spare parts or customer support for that product model , to give anyone who possesses the object code either ( 1 ) a copy of the Corresponding Source for all the software in the product that is covered by this License , on a durable physical medium customarily used for software interchange , for a price no more than your reasonable cost of physically performing this conveying of source , or ( 2 ) access to copy the Corresponding Source from a network server at no charge . c ) Convey individual copies of the object code with a copy of the written offer to provide the Corresponding Source . This alternative is allowed only occasionally and noncommercially , and only if you received the object code with such an offer , in accord with subsection 6b . d ) Convey the object code by offering access from a designated place ( gratis or for a charge ) , and offer equivalent access to the Corresponding Source in the same way through the same place at no further charge . You need not require recipients to copy the Corresponding Source along with the object code . If the place to copy the object code is a network server , the Corresponding Source may be on a different server ( operated by you or a third party ) that supports equivalent copying facilities , provided you maintain clear directions next to the object code saying where to find the Corresponding Source . Regardless of what server hosts the Corresponding Source , you remain obligated to ensure that it is available for as long as needed to satisfy these requirements . e ) Convey the object code using peer-to-peer transmission , provided you inform other peers where the object code and Corresponding Source of the work are being offered to the general public at no charge under subsection 6d . A separable portion of the object code , whose source code is excluded from the Corresponding Source as a System Library , need not be included in conveying the object code work . A " User Product " is either ( 1 ) a " consumer product " , which means any tangible personal property which is normally used for personal , family , or household purposes , or ( 2 ) anything designed or sold for incorporation into a dwelling . In determining whether a product is a consumer product , doubtful cases shall be resolved in favor of coverage . For a particular product received by a particular user , " normally used " refers to a typical or common use of that class of product , regardless of the status of the particular user or of the way in which the particular user actually uses , or expects or is expected to use , the product . A product is a consumer product regardless of whether the product has substantial commercial , industrial or non-consumer uses , unless such uses represent the only significant mode of use of the product . " Installation Information " for a User Product means any methods , procedures , authorization keys , or other information required to install and execute modified versions of a covered work in that User Product from a modified version of its Corresponding Source . The information must suffice to ensure that the continued functioning of the modified object code is in no case prevented or interfered with solely because modification has been made . If you convey an object code work under this section in , or with , or specifically for use in , a User Product , and the conveying occurs as part of a transaction in which the right of possession and use of the User Product is transferred to the recipient in perpetuity or for a fixed term ( regardless of how the transaction is characterized ) , the Corresponding Source conveyed under this section must be accompanied by the Installation Information . But this requirement does not apply if neither you nor any third party retains the ability to install modified object code on the User Product ( for example , the work has been installed in ROM ) . The requirement to provide Installation Information does not include a requirement to continue to provide support service , warranty , or updates for a work that has been modified or installed by the recipient , or for the User Product in which it has been modified or installed . Access to a network may be denied when the modification itself materially and adversely affects the operation of the network or violates the rules and protocols for communication across the network . Corresponding Source conveyed , and Installation Information provided , in accord with this section must be in a format that is publicly documented ( and with an implementation available to the public in source code form ) , and must require no special password or key for unpacking , reading or copying . 7 . Additional Terms . " Additional permissions " are terms that supplement the terms of this License by making exceptions from one or more of its conditions . Additional permissions that are applicable to the entire Program shall be treated as though they were included in this License , to the extent that they are valid under applicable law . If additional permissions apply only to part of the Program , that part may be used separately under those permissions , but the entire Program remains governed by this License without regard to the additional permissions . When you convey a copy of a covered work , you may at your option remove any additional permissions from that copy , or from any part of it . ( Additional permissions may be written to require their own removal in certain cases when you modify the work . ) You may place additional permissions on material , added by you to a covered work , for which you have or can give appropriate copyright permission . Notwithstanding any other provision of this License , for material you add to a covered work , you may ( if authorized by the copyright holders of that material ) supplement the terms of this License with terms : a ) Disclaiming warranty or limiting liability differently from the terms of sections 15 and 16 of this License ; or b ) Requiring preservation of specified reasonable legal notices or author attributions in that material or in the Appropriate Legal Notices displayed by works containing it ; or c ) Prohibiting misrepresentation of the origin of that material , or requiring that modified versions of such material be marked in reasonable ways as different from the original version ; or d ) Limiting the use for publicity purposes of names of licensors or authors of the material ; or e ) Declining to grant rights under trademark law for use of some trade names , trademarks , or service marks ; or f ) Requiring indemnification of licensors and authors of that material by anyone who conveys the material ( or modified versions of it ) with contractual assumptions of liability to the recipient , for any liability that these contractual assumptions directly impose on those licensors and authors . All other non-permissive additional terms are considered " further restrictions " within the meaning of section 10 . If the Program as you received it , or any part of it , contains a notice stating that it is governed by this License along with a term that is a further restriction , you may remove that term . If a license document contains a further restriction but permits relicensing or conveying under this License , you may add to a covered work material governed by the terms of that license document , provided that the further restriction does not survive such relicensing or conveying . If you add terms to a covered work in accord with this section , you must place , in the relevant source files , a statement of the additional terms that apply to those files , or a notice indicating where to find the applicable terms . Additional terms , permissive or non-permissive , may be stated in the form of a separately written license , or stated as exceptions ; the above requirements apply either way . 8 . Termination . You may not propagate or modify a covered work except as expressly provided under this License . Any attempt otherwise to propagate or modify it is void , and will automatically terminate your rights under this License ( including any patent licenses granted under the third paragraph of section 11 ) . However , if you cease all violation of this License , then your license from a particular copyright holder is reinstated ( a ) provisionally , unless and until the copyright holder explicitly and finally terminates your license , and ( b ) permanently , if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation . Moreover , your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means , this is the first time you have received notice of violation of this License ( for any work ) from that copyright holder , and you cure the violation prior to 30 days after your receipt of the notice . Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License . If your rights have been terminated and not permanently reinstated , you do not qualify to receive new licenses for the same material under section 10 . 9 . Acceptance Not Required for Having Copies . You are not required to accept this License in order to receive or run a copy of the Program . Ancillary propagation of a covered work occurring solely as a consequence of using peer-to-peer transmission to receive a copy likewise does not require acceptance . However , nothing other than this License grants you permission to propagate or modify any covered work . These actions infringe copyright if you do not accept this License . Therefore , by modifying or propagating a covered work , you indicate your acceptance of this License to do so . 10 . Automatic Licensing of Downstream Recipients . Each time you convey a covered work , the recipient automatically receives a license from the original licensors , to run , modify and propagate that work , subject to this License . You are not responsible for enforcing compliance by third parties with this License . An " entity transaction " is a transaction transferring control of an organization , or substantially all assets of one , or subdividing an organization , or merging organizations . If propagation of a covered work results from an entity transaction , each party to that transaction who receives a copy of the work also receives whatever licenses to the work the party's predecessor in interest had or could give under the previous paragraph , plus a right to possession of the Corresponding Source of the work from the predecessor in interest , if the predecessor has it or can get it with reasonable efforts . You may not impose any further restrictions on the exercise of the rights granted or affirmed under this License . For example , you may not impose a license fee , royalty , or other charge for exercise of rights granted under this License , and you may not initiate litigation ( including a cross-claim or counterclaim in a lawsuit ) alleging that any patent claim is infringed by making , using , selling , offering for sale , or importing the Program or any portion of it . 11 . Patents . A " contributor " is a copyright holder who authorizes use under this License of the Program or a work on which the Program is based . The work thus licensed is called the contributor's " contributor version " . A contributor's " essential patent claims " are all patent claims owned or controlled by the contributor , whether already acquired or hereafter acquired , that would be infringed by some manner , permitted by this License , of making , using , or selling its contributor version , but do not include claims that would be infringed only as a consequence of further modification of the contributor version . For purposes of this definition , " control " includes the right to grant patent sublicenses in a manner consistent with the requirements of this License . Each contributor grants you a non-exclusive , worldwide , royalty-free patent license under the contributor's essential patent claims , to make , use , sell , offer for sale , import and otherwise run , modify and propagate the contents of its contributor version . In the following three paragraphs , a " patent license " is any express agreement or commitment , however denominated , not to enforce a patent ( such as an express permission to practice a patent or covenant not to sue for patent infringement ) . To " grant " such a patent license to a party means to make such an agreement or commitment not to enforce a patent against the party . If you convey a covered work , knowingly relying on a patent license , and the Corresponding Source of the work is not available for anyone to copy , free of charge and under the terms of this License , through a publicly available network server or other readily accessible means , then you must either ( 1 ) cause the Corresponding Source to be so available , or ( 2 ) arrange to deprive yourself of the benefit of the patent license for this particular work , or ( 3 ) arrange , in a manner consistent with the requirements of this License , to extend the patent license to downstream recipients . " Knowingly relying " means you have actual knowledge that , but for the patent license , your conveying the covered work in a country , or your recipient's use of the covered work in a country , would infringe one or more identifiable patents in that country that you have reason to believe are valid . If , pursuant to or in connection with a single transaction or arrangement , you convey , or propagate by procuring conveyance of , a covered work , and grant a patent license to some of the parties receiving the covered work authorizing them to use , propagate , modify or convey a specific copy of the covered work , then the patent license you grant is automatically extended to all recipients of the covered work and works based on it . A patent license is " discriminatory " if it does not include within the scope of its coverage , prohibits the exercise of , or is conditioned on the non-exercise of one or more of the rights that are specifically granted under this License . You may not convey a covered work if you are a party to an arrangement with a third party that is in the business of distributing software , under which you make payment to the third party based on the extent of your activity of conveying the work , and under which the third party grants , to any of the parties who would receive the covered work from you , a discriminatory patent license ( a ) in connection with copies of the covered work conveyed by you ( or copies made from those copies ) , or ( b ) primarily for and in connection with specific products or compilations that contain the covered work , unless you entered into that arrangement , or that patent license was granted , prior to 28 March 2007 . Nothing in this License shall be construed as excluding or limiting any implied license or other defenses to infringement that may otherwise be available to you under applicable patent law . 12 . No Surrender of Others' Freedom . If 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 can not convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations , then as a consequence you may not convey it at all . For example , if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program , the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program . 13 . Use with the GNU Affero General Public License . Notwithstanding any other provision of this License , you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work , and to convey the resulting work . The terms of this License will continue to apply to the part which is the covered work , but the special requirements of the GNU Affero General Public License , section 13 , concerning interaction through a network will apply to the combination as such . 14 . Revised Versions of this License . The Free Software Foundation may publish revised and / or new versions of the GNU 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 that a certain numbered version of the GNU General Public License " or any later version " applies to it , you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation . If the Program does not specify a version number of the GNU General Public License , you may choose any version ever published by the Free Software Foundation . If the Program specifies that a proxy can decide which future versions of the GNU General Public License can be used , that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Program . Later license versions may give you additional or different permissions . However , no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version . 15 . Disclaimer of Warranty . 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 . 16 . Limitation of Liability . IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER , OR ANY OTHER PARTY WHO MODIFIES AND / OR CONVEYS 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 . 17 . Interpretation of Sections 15 and 16 . If the disclaimer of warranty and limitation of liability provided above can not be given local legal effect according to their terms , reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program , unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee . END OF TERMS AND CONDITIONS