Answer: 

Intel announced the creation of an open source project (threadingbuildingblocks.org ) for Intel® Threading Building Blocks (Intel® TBB) on July 24, 2007. Intel reiterated its commitment to making Intel® TBB a viable and strong option for expressing concurrency in C++ by announcing at the same time that it was adding people to this project. Intel® TBB is now available as an open source project under the GNU General Public License version two (GPLv2) with the (libstdc++) runtime exception.