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The FreeRTOS GPL Exception Text:
Any FreeRTOS source code, whether modifi ed or in it’s original
release form, or whether in whole or in part, can only be distributed
by you under the terms of the GNU General Public License plus this
exception. An independent module is a module which is not derived
from or based on FreeRTOS.
Clause 1:
Linking FreeRTOS statically or dynamically with other modules is
making a combined work based on FreeRTOS. Thus, the terms
and conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holder of FreeRTOS gives
you permission to link FreeRTOS with independent modules that
communicate with FreeRTOS solely through the FreeRTOS API
interface, regardless of the license terms of these independent
modules, and to copy and distribute the resulting combined work
under terms of your choice, provided that
+ Every copy of the combined work is accompanied by a written
statement that details to the recipient the version of FreeRTOS
used and an offer by yourself to provide the FreeRTOS source
code (including any modifi cations you may have made) should
the recipient request it.
+ The combined work is not itself an RTOS, scheduler, kernel
or related product.
+ The independent modules add signifi cant and primary
functionality to FreeRTOS and do not merely extend the existing
functionality already present in FreeRTOS.
Clause 2:
FreeRTOS may not be used for any competitive or comparative
purpose, including the publication of any form of run time or compile
time metric, without the express permission of Real Time Engineers
Ltd. (this is the norm within the industry and is intended to ensure
information accuracy).
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The standard GPL exception text:
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 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.
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 Library 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 modifi ed 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 refl ect on
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Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that redistributors of a free
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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
modifi cation 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
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and/or translated into another language. (Hereinafter, translation is
included without limitation in the term “modifi cation”.) Each licensee is
addressed as “you”.
Activities other than copying, distribution and modifi cation 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 modifi cations or work under the terms of Section 1
above, provided that you also meet all of these conditions:
a) You must cause the modifi ed fi les to carry prominent notices
stating that you changed the fi les 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 modifi ed program normally reads commands interactively
when run, you must cause it, when started running for such
nteractive 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 does
not normally print such an announcement, your work based on
the Program is not required to print an announcement.)
Copyright
3
These requirements apply to the modifi ed work as a whole. If
identifi able 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
cost of physically performing source distribution, a complete
machine-readable copy of the corresponding source code, to
be distributed under the terms of Sections 1 and 2 above on a
medium customarily used for software interchange; or,
c) Accompany it with the information you received as to the
offer to distribute corresponding source code. (This alternative
is allowed only for noncommercial distribution and only if you
received the program in object code or executable form with such
an offer, in accord with Subsection b above.)
The source code for a work means the preferred form of the work for
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associated interface defi nition fi les, plus the scripts used to control
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exception, the source code 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
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If distribution of executable or 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 counts as distribution of
the source code, even though third parties are not 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
parties remain in full compliance.
5. 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 Program or its derivative works. These
actions are prohibited by law if you do not accept this License.
Therefore, by 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 original licensor to copy, distribute or modify
the Program 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 to this License.
7. 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
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 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.
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 specifi es 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 Program does
not specify a version number of this License, you may choose
any version ever published by the Free Software Foundation.
10. If you wish to incorporate parts of the Program into
other free programs whose distribution conditions are different,
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.
Copyright
2
