mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-05 07:56:35 +00:00
502 lines
26 KiB
Text
502 lines
26 KiB
Text
GNU LESSER GENERAL PUBLIC LICENSE
|
||
Version 2.1, February 1999
|
||
|
||
Copyright (C) 1991, 1999 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.
|
||
|
||
[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
|
||
are the reason we use the ordinary General Public License for many
|
||
libraries. However, the Lesser license provides advantages in certain
|
||
special circumstances.
|
||
|
||
For example, on rare occasions, there may be a special need to
|
||
encourage the widest possible use of a certain library, so that it becomes
|
||
a de-facto standard. To achieve this, non-free programs must be
|
||
allowed to use the library. A more frequent case is that a free
|
||
library does the same job as widely used non-free libraries. In this
|
||
case, there is little to gain by limiting the free library to free
|
||
software only, so we use the Lesser General Public License.
|
||
|
||
In other cases, permission to use a particular library in non-free
|
||
programs enables a greater number of people to use a large body of
|
||
free software. For example, permission to use the GNU C Library in
|
||
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
|
||
other authorized party saying it may be distributed under the terms of
|
||
this Lesser General Public License (also called "this License").
|
||
Each licensee is addressed as "you".
|
||
|
||
A "library" means a collection of software functions and/or data
|
||
prepared so as to be conveniently linked with application programs
|
||
(which use some of those functions and data) to form executables.
|
||
|
||
The "Library", below, refers to any such software library or work
|
||
which has been distributed under these terms. A "work based on the
|
||
Library" means either the Library or any derivative work under
|
||
copyright law: that is to say, a work containing the Library or a
|
||
portion of it, either verbatim or with modifications and/or translated
|
||
straightforwardly into another language. (Hereinafter, translation is
|
||
included without limitation in the term "modification".)
|
||
|
||
"Source code" for a work means the preferred form of the work for
|
||
making modifications to it. For a library, 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 library.
|
||
|
||
Activities other than copying, distribution and modification are not
|
||
covered by this License; they are outside its scope. The act of
|
||
running a program using the Library is not restricted, and output from
|
||
such a program is covered only if its contents constitute a work based
|
||
on the Library (independent of the use of the Library in a tool for
|
||
writing it). Whether that is true depends on what the Library does
|
||
and what the program that uses the Library does.
|
||
|
||
1. You may copy and distribute verbatim copies of the Library's
|
||
complete 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 distribute a copy of this License along with the
|
||
Library.
|
||
|
||
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 Library or any portion
|
||
of it, thus forming a work based on the Library, 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) The modified work must itself be a software library.
|
||
|
||
b) You must cause the files modified to carry prominent notices
|
||
stating that you changed the files and the date of any change.
|
||
|
||
c) You must cause the whole of the work to be licensed at no
|
||
charge to all third parties under the terms of this License.
|
||
|
||
d) If a facility in the modified Library refers to a function or a
|
||
table of data to be supplied by an application program that uses
|
||
the facility, other than as an argument passed when the facility
|
||
is invoked, then you must make a good faith effort to ensure that,
|
||
in the event an application does not supply such function or
|
||
table, the facility still operates, and performs whatever part of
|
||
its purpose remains meaningful.
|
||
|
||
(For example, a function in a library to compute square roots has
|
||
a purpose that is entirely well-defined independent of the
|
||
application. Therefore, Subsection 2d requires that any
|
||
application-supplied function or table used by this function must
|
||
be optional: if the application does not supply it, the square
|
||
root function must still compute square roots.)
|
||
|
||
These requirements apply to the modified work as a whole. If
|
||
identifiable sections of that work are not derived from the Library,
|
||
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 Library, 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 Library.
|
||
|
||
In addition, mere aggregation of another work not based on the Library
|
||
with the Library (or with a work based on the Library) on a volume of
|
||
a storage or distribution medium does not bring the other work under
|
||
the scope of this License.
|
||
|
||
3. You may opt to apply the terms of the ordinary GNU General Public
|
||
License instead of this License to a given copy of the Library. To do
|
||
this, you must alter all the notices that refer to this License, so
|
||
that they refer to the ordinary GNU General Public License, version 2,
|
||
instead of to this License. (If a newer version than version 2 of the
|
||
ordinary GNU General Public License has appeared, then you can specify
|
||
that version instead if you wish.) Do not make any other change in
|
||
these notices.
|
||
|
||
Once this change is made in a given copy, it is irreversible for
|
||
that copy, so the ordinary GNU General Public License applies to all
|
||
subsequent copies and derivative works made from that copy.
|
||
|
||
This option is useful when you wish to copy part of the code of
|
||
the Library into a program that is not a library.
|
||
|
||
4. You may copy and distribute the Library (or a portion or
|
||
derivative of it, under Section 2) in object code or executable form
|
||
under the terms of Sections 1 and 2 above provided that you 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.
|
||
|
||
If distribution of 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 satisfies the requirement to
|
||
distribute the source code, even though third parties are not
|
||
compelled to copy the source along with the object code.
|
||
|
||
5. A program that contains no derivative of any portion of the
|
||
Library, but is designed to work with the Library by being compiled or
|
||
linked with it, is called a "work that uses the Library". Such a
|
||
work, in isolation, is not a derivative work of the Library, and
|
||
therefore falls outside the scope of this License.
|
||
|
||
However, linking a "work that uses the Library" with the Library
|
||
creates an executable that is a derivative of the Library (because it
|
||
contains portions of the Library), rather than a "work that uses the
|
||
library". The executable is therefore covered by this License.
|
||
Section 6 states terms for distribution of such executables.
|
||
|
||
When a "work that uses the Library" uses material from a header file
|
||
that is part of the Library, the object code for the work may be a
|
||
derivative work of the Library even though the source code is not.
|
||
Whether this is true is especially significant if the work can be
|
||
linked without the Library, or if the work is itself a library. The
|
||
threshold for this to be true is not precisely defined by law.
|
||
|
||
If such an object file uses only numerical parameters, data
|
||
structure layouts and accessors, and small macros and small inline
|
||
functions (ten lines or less in length), then the use of the object
|
||
file is unrestricted, regardless of whether it is legally a derivative
|
||
work. (Executables containing this object code plus portions of the
|
||
Library will still fall under Section 6.)
|
||
|
||
Otherwise, if the work is a derivative of the Library, you may
|
||
distribute the object code for the work under the terms of Section 6.
|
||
Any executables containing that work also fall under Section 6,
|
||
whether or not they are linked directly with the Library itself.
|
||
|
||
6. As an exception to the Sections above, you may also combine or
|
||
link a "work that uses the Library" with the Library to produce a
|
||
work containing portions of the Library, and distribute that work
|
||
under terms of your choice, provided that the terms permit
|
||
modification of the work for the customer's own use and reverse
|
||
engineering for debugging such modifications.
|
||
|
||
You must give prominent notice with each copy of the work that the
|
||
Library is used in it and that the Library and its use are covered by
|
||
this License. You must supply a copy of this License. If the work
|
||
during execution displays copyright notices, you must include the
|
||
copyright notice for the Library among them, as well as a reference
|
||
directing the user to the copy of this License. Also, you must do one
|
||
of these things:
|
||
|
||
a) Accompany the work with the complete corresponding
|
||
machine-readable source code for the Library including whatever
|
||
changes were used in the work (which must be distributed under
|
||
Sections 1 and 2 above); and, if the work is an executable linked
|
||
with the Library, with the complete machine-readable "work that
|
||
uses the Library", as object code and/or source code, so that the
|
||
user can modify the Library and then relink to produce a modified
|
||
executable containing the modified Library. (It is understood
|
||
that the user who changes the contents of definitions files in the
|
||
Library will not necessarily be able to recompile the application
|
||
to use the modified definitions.)
|
||
|
||
b) Use a suitable shared library mechanism for linking with the
|
||
Library. A suitable mechanism is one that (1) uses at run time a
|
||
copy of the library already present on the user's computer system,
|
||
rather than copying library functions into the executable, and (2)
|
||
will operate properly with a modified version of the library, if
|
||
the user installs one, as long as the modified version is
|
||
interface-compatible with the version that the work was made with.
|
||
|
||
c) Accompany the work with a written offer, valid for at
|
||
least three years, to give the same user the materials
|
||
specified in Subsection 6a, above, for a charge no more
|
||
than the cost of performing this distribution.
|
||
|
||
d) If distribution of the work is made by offering access to copy
|
||
from a designated place, offer equivalent access to copy the above
|
||
specified materials from the same place.
|
||
|
||
e) Verify that the user has already received a copy of these
|
||
materials or that you have already sent this user a copy.
|
||
|
||
For an executable, the required form of the "work that uses the
|
||
Library" must include any data and utility programs needed for
|
||
reproducing the executable from it. However, as a special exception,
|
||
the materials to be 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.
|
||
|
||
It may happen that this requirement contradicts the license
|
||
restrictions of other proprietary libraries that do not normally
|
||
accompany the operating system. Such a contradiction means you cannot
|
||
use both them and the Library together in an executable that you
|
||
distribute.
|
||
|
||
7. You may place library facilities that are a work based on the
|
||
Library side-by-side in a single library together with other library
|
||
facilities not covered by this License, and distribute such a combined
|
||
library, provided that the separate distribution of the work based on
|
||
the Library and of the other library facilities is otherwise
|
||
permitted, and provided that you do these two things:
|
||
|
||
a) Accompany the combined library with a copy of the same work
|
||
based on the Library, uncombined with any other library
|
||
facilities. This must be distributed under the terms of the
|
||
Sections above.
|
||
|
||
b) Give prominent notice with the combined library of the fact
|
||
that part of it is a work based on the Library, and explaining
|
||
where to find the accompanying uncombined form of the same work.
|
||
|
||
8. You may not copy, modify, sublicense, link with, or distribute
|
||
the Library except as expressly provided under this License. Any
|
||
attempt otherwise to copy, modify, sublicense, link with, or
|
||
distribute the Library 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.
|
||
|
||
9. 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 Library or its derivative works. These actions are
|
||
prohibited by law if you do not accept this License. Therefore, by
|
||
modifying or distributing the Library (or any work based on the
|
||
Library), you indicate your acceptance of this License to do so, and
|
||
all its terms and conditions for copying, distributing or modifying
|
||
the Library or works based on it.
|
||
|
||
10. Each time you redistribute the Library (or any work based on the
|
||
Library), the recipient automatically receives a license from the
|
||
original licensor to copy, distribute, link with or modify the Library
|
||
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 with
|
||
this License.
|
||
|
||
11. 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 Library at all. For example, if a patent
|
||
license would not permit royalty-free redistribution of the Library 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 Library.
|
||
|
||
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.
|
||
|
||
12. If the distribution and/or use of the Library is restricted in
|
||
certain countries either by patents or by copyrighted interfaces, the
|
||
original copyright holder who places the Library 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.
|
||
|
||
13. The Free Software Foundation may publish revised and/or new
|
||
versions of the Lesser 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 Library
|
||
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 Library does not specify a
|
||
license version number, you may choose any version ever published by
|
||
the Free Software Foundation.
|
||
|
||
14. If you wish to incorporate parts of the Library into other free
|
||
programs whose distribution conditions are incompatible with these,
|
||
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
|
||
|
||
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
|
||
WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
|
||
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
|
||
OTHER PARTIES PROVIDE THE LIBRARY "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
|
||
LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
|
||
THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
|
||
|
||
16. 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 LIBRARY 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
|
||
LIBRARY (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 LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), 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 Libraries
|
||
|
||
If you develop a new library, and you want it to be of the greatest
|
||
possible use to the public, we recommend making it free software that
|
||
everyone can redistribute and change. You can do so by permitting
|
||
redistribution under these terms (or, alternatively, under the terms of the
|
||
ordinary General Public License).
|
||
|
||
To apply these terms, attach the following notices to the library. 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 library's name and a brief idea of what it does.>
|
||
Copyright (C) <year> <name of author>
|
||
|
||
This library is free software; you can redistribute it and/or
|
||
modify it under the terms of the GNU Lesser General Public
|
||
License as published by the Free Software Foundation; either
|
||
version 2.1 of the License, or (at your option) any later version.
|
||
|
||
This library 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
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public
|
||
License along with this library; if not, write to the Free Software
|
||
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
||
Also add information on how to contact you by electronic and paper mail.
|
||
|
||
You should also get your employer (if you work as a programmer) or your
|
||
school, if any, to sign a "copyright disclaimer" for the library, if
|
||
necessary. Here is a sample; alter the names:
|
||
|
||
Yoyodyne, Inc., hereby disclaims all copyright interest in the
|
||
library `Frob' (a library for tweaking knobs) written by James Random Hacker.
|
||
|
||
<signature of Ty Coon>, 1 April 1990
|
||
Ty Coon, President of Vice
|
||
|
||
That's all there is to it!
|