As one of the WebAPPers... there are no requirements for you to sign up to download anything.
unless some shmo set the downloads to members only, which is not a normal situation on the development site.
As for signing up, whats wrong with joining up??? makes it easier to ask the technical questions you will most likely have...
As for the license, its in the download package and is on the site... basic breakdown of the license is this...
Its open source, use it, change it modify it... just dont claim you wrote it... as long as your not going to do that... you have nothing to worry about.
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