add relicense.md file

add relicense.md file boxkey.md

Author: boxkey

RELICENSE/boxkey.md

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+# Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+
+This is a statement by boxkey that grants permission to relicense its copyrights in the libzmq C++ library (ZeroMQ) under the Mozilla Public License v2 (MPLv2) or any other Open Source Initiative approved license chosen by the current ZeroMQ BDFL (Benevolent Dictator for Life).
+
+A portion of the commits made by the Github handle "boxkey", with commit author "boxkey [[email protected]]([email protected])", are copyright of boxkey. This document hereby grants the libzmq project team to relicense libzmq, including all past, present and future contributions of the author listed above.
+
+boxkey 2020/11/30