Licensing question

[Emil Lists]

I'm doing a small application to be used entirely within a company's intranet. It uses Pylons, Pylons, SQLAlchemy, etc. If I use ext.js for the javascript library, what does open source licensing mean?

Update: and if there's a clear answer to this question, a link that I could include in the source would be great in case this question comes up later. Please don't make me go back to YUI!

[hendricd]

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