[greggman]

Really? I've been putting the license in every file in my project because it's JavaScript and people drive by a website, see "foo.js" and have no idea where it came from or what license it's under. With the license in the file it's immediately clear.

[towelguy]

If the file doesn't have a copyright notice, I'd assume the author is the website's owner and its license should apply.

Maybe there should be a convention to add a copyright.txt file to websites like there is robots.txt and humans.txt?

[davedx]

Usually you'd concatenate and minify deployed JavaScript anyway. Sometimes you get a license in that, sometimes you don't. I don't think that many people really copy that much JavaScript from live sites these days...