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I think the MIT license doesn't "infect" the product. You put the license in the software that creates the, say, PDF. But once printed the license doesn't apply.

Imagine having to slap the Latex license to every work you do with that software.

Confused by this exact question. Similarly, can they be used in a closed source app or website? Where/how do you include the license?

In a closed source app, you can make a 'credits' button that lists the various MIT/BSD licenses that you're utilizing. On a website, you might find it under 'legal' or 'about' etc.

Probably with a sticker on the object, pointing to a URL containing the full list of licenses.