# Release Notes » Release 1.x.x (before 2018)

Prior to being open-source in 2018, Cpp-Taskflow was internal to the OpenTimer project sponsored by the NSF and DARPA. Later, we decided to open our knowledge of parallelizing large-scale parallel applications by making Cpp-Taskflow a standalone open-source project that can benefit generic C++ developers.

Due to the difference license agreement imposed by OpenTimer at an earlier stage (i.e., users and funding agency requirement), we are unable to open the source of Cpp-Taskflow in the 1.x line. Starting from 2.x, we have switched to MIT license and made the source completely open and transparent to the community.

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