Intel Threading Building Blocks 2.2 License.pdf

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Licensing

Threading Building Blocks FAQ

General Questions about TBB

Licensing

Using TBB

Reporting Issues with TBB

Contributing to TBB

Contents [ hide ]

1 How is TBB licensed?

2 What is the COM license and what does it offer?

3 What is the OSS license and what does it offer?

4 Why is TBB licensed under GPL v2 with the

libstdC++ Runtime Exception?

5 What is dual-licensing?

6 Why does TBB use dual-licensing?

7 What are the ramifications of dual-licensing?

8 What is the contribution process?

9 Why is there a contribution process?

10 Which license is right for my needs?

How is TBB licensed?

[ edit ]

TBB is dual-licensed, with a commercial (COM)

license and a GPL v2-based open source (OSS)

license. Please pay close attention to the usage

restrictions each license uses to make sure you are

using the proper version.

What is the COM license and what

does it offer?

[ edit ]

One year of technical support and product

updates. For more information about the COM

license please refer to the licensing agreement

section at www.threadingbuildingblocks.com .

In addition, there is a free evaluation (30-days of

support and updates) license available from the

commercial website. Although we used to offer a

free non-commercial version of TBB that license

type is no longer available due to the availability of

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OSS TBB.

What is the OSS license and what

does it offer?

[ edit ]

TBB is available under the common OSS license

GPL v2 with the libstdC++ Runtime Exception. This

is the same license used for a variety of well-

known OSS applications including MySQL,

NetBeans, and the Linux kernel.

Why is TBB licensed under GPL v2

with the libstdC++ Runtime Exception?

[ edit ]

Because GPL v2, and the libstdC++ Runtime

Exception, are frequently used in the open source

community and they are widely accepted and well

understood. For complete descriptions please visit

the official GNU website for GPL v2 and the

Runtime Exception .

Although GPL v3 was considered for the OSS

license of TBB it was not available at the time the

product was open-sourced.

What is dual-licensing?

[ edit ]

Wikipedia offers a description of dual-licensing for

software, “Dual-licensing is the practice of

distributing software under two different sets of

terms and conditions.” The articles later states,

“When software is dual-licensed, recipients can

choose which terms they want to use or distribute

the software under.” This is true of the dual-

licensing used by TBB.

Although TBB is dual-licensed, both the COM and

OSS versions are derived from the exact same

code base (source and/or binaries).

Why does TBB use dual-licensing?

[ edit ]

Some users of TBB want or require a COM license.

Who are these users and why might they require

this license type?

Commercial customers often want or require

certain aspects particular to the COM license

type. Some of these items might include

guaranteed and private support services,

product updates, or other provisions of COM

license. The COM license is available only for

those versions of TBB that have validated and

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supported binaries for a limited number of

platforms. This means that those versions are

the most stable and most tested releases. In

conjunction with each COM release of TBB we

also release the same source code and binaries

via the OSS commercial-aligned releases.

Some other Intel COM software products (e.g.

Intel® Compiler Professional Editions, Intel®

Parallel Studio, etc.) are used by COM users of

TBB. Some of those products include COM

licenses for TBB and therefore many users of

TBB are most comfortable using the version of

TBB they acquired through a COM product

bundle.

Some users of TBB want or require OSS licenses.

Who are these users and why might they require

this license type?

Open-source customers often want or require

certain aspects particular to the OSS license

type. Some of these items might include the

very latest developer updates, free access to

the source code, or other provisions of OSS

license.

What are the ramifications of

dual-licensing?

[ edit ]

Users of TBB can get the same exact code as any

TBB COM release (same code base, same binaries)

under either the COM or OSS license.

More frequent releases are available under the

OSS license (stable releases, with source code and

validated binaries; or development releases, with

source code, but no binaries).

COM or OSS users of TBB can use the contribution

process on threadingbuildingblocks.org to make

changes to TBB.

What is the contribution process?

[ edit ]

To learn more about TBB’s contribution process

please refer to the contribution section of

threadingbuildingblocks.org here .

Why is there a contribution

process?

[ edit ]

In order for TBB to be released under multiple

licenses, with COM being one of them, Intel must

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maintain rights to the code base.

For Intel to maintain rights to the code base it

needs to dual-license, contributors to the TBB

project must contribute their code and explicitly

agree to the contribution terms in order to

properly assign these rights to Intel.

When you contribute you don’t lose rights to your

code (we give them right back to you!), but you

give us enough rights that we can make the

outbound dual-licensing work. MySQL and other

GPL v2 users work the same way.

The best way to make changes to TBB is to

contribute them. That way they get into the main

source base for TBB and will be included and

tested in all future releases.

Which license is right for my

needs?

[ edit ]

TBB is available commercially as a binary

distribution, and in open source in both source and

binary forms. If you need commercial support

services you should purchase either a standalone

commercial license or take advantage of the

considerable value in purchasing the Intel®

Parallel Studio or Intel® Compiler Professional

Edition . If your legal counsel is comfortable with

your use of software under the Intel TBB open

source license, GPL v2 with the Runtime Exception,

and you do not require commercial support

services, please download the latest version of

open source TBB here . Finally, if you require the

ability to modify or distribute the commercial

source code of TBB, contact your Intel

representative for more information.

When built from source, TBB is intended to be

highly portable, and so it supports a wide variety

of operating systems and platforms. Binary

distributions, including commercial distributions,

are validated and officially supported for only

certain hardware and software platforms,

operating systems, and compilers.

article

edit

history

Your use of this webpage, including comments you post are governed by the Terms of use for this website.

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GNU GENERAL PUBLIC LICENSE

Version 2, June 1991

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.

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 Lesser 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

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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 modified 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 reflect on the original

authors' reputations.

Finally, any free program is threatened constantly by software

patents. We wish to avoid the danger that redistributors of a free

program will individually obtain patent licenses, in effect making the

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

modification 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"

http://www.gnu.org/licenses/gpl-2.0.txt

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