Point 1: Michał Masłowski say it correct. There are three ECMAScript, Javascript, ActionScript and JSScript. I think the Internet Explorer from Microsoft use ActionScript, but maybe this could be wrong.

Point 2: You can use JQuery, but personally I didn't like it. There are a few alternatives maybe AngularJS it has an MIT License.

Point 3: Sorry but I have only a very small background about license, I hope somebody else could help you.

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