We can't accept PRs that contain copyright to other entities.

Per the CLA: http://cakefoundation.org/pages/cla

(extract)

2. Grant of Copyright License. Subject to the terms and conditions of this Agreement, You hereby grant 
to the Foundation and to recipients of software distributed by the Foundation a perpetual, worldwide, 
nonexclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works 
of, publicly display, publicly perform, sub-license, and distribute Your Contributions and such derivative 
works

Please check the Individual and Corporate CLAs depending on your situation.