This module is a cythonized version of https://github.com/cloudpipe/cloudpickle and pickle._Pickler and is meant to be a drop in replacement which is about twice as fast.
The cloudpickle license is included in cycloudpickle.cycloudpickle. The Python software foundation license applies to the adaptation of pickle._Pickler.
While cloudpickle is compatible with python 2, cycloudpickle is not due the adaptation of the pickle._Pickler from python 3. Python 2 support should be 'doable', but a bit difficult because of the use of cdef classes and the inheritance between CloudPickler and Pickler.