The MPL 2.0 license is a "file-level" copyleft license vs the
"project-level" nature of the L/GPL. The intention of the websock.js
file has always been that it should be easy to incorporate into
existing projects and sites whether free/open or
proprietary/commercial. The MPL 2.0 is designed for this sort of
combination project but still requires that any distributed
modifications to noVNC source files must also be published under the
same license.
In addition, the MPL 2.0 allows the code to be used in L/GPL projects
(the secondary license clause). This means that any projects that are
already incorporating noVNC should not be impacted by this change and
in fact it should clarify the licensing situation (the exact
application of the L/GPL to web applications and interpreted code is
somewhat ambiguous).
The dependencies on include/websock.js are also updated to MPL 2.0
including util.js and webutil.js. The base64.js has been updated to
the MPL 2.0 licensed version from Mozilla.
The websockify python code (and other implementations) remain under
a LGPLv3 license.
Joel Martin