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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 cannot 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.
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