Index: frontend/node_modules/sockjs/COPYING
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--- frontend/node_modules/sockjs/COPYING	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/sockjs/COPYING	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
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+Parts of the code are derived from various open source projects.
+
+For code derived from Socket.IO by Guillermo Rauch see
+https://github.com/LearnBoost/socket.io/tree/0.6.17#readme.
+
+All other code is released on MIT license, see LICENSE.