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This has nothing to do with Java licensing, it's a piece of javascript to detect whether you have Java installed or not.

I think someone else pointed this out, but the Oracle license is included because the javascript references [http://www.java.com/js/deployJava.txt].

From the comments in the reference:

* deployJava.js

*

* This file is part of the Deployment Toolkit. It provides functions for web

* pages to detect the presence of a JRE, install the latest JRE, and easily run

* applets or Web Start programs.

i e Sun/Oracle own the code Facebook is using.