1. the copyright notice
2. the text itself that explains that you/others have this permission/obligation
Currently, it looks like NumPad isn't doing either.
From comments here, NumPad is evidently also using decimal.js, which has similar terms.
There's a reason why everyone who has their ducks in a row (in other words, people with competent legal counsel along with something to lose, e.g. Mozilla, Google, Apple, Microsoft, etc) will bake something like about:license into the stuff they work on, even if it's buried in some "open source licenses" entry of an About screen reachable by the last menu item in the system settings. Spoiler alert: it's because they have to—in order to comply with the terms of the license. It's not because they just think it's the nice thing to do. (And definitely not because it's fun and easy to do, because it's not.)
That's simply not true. Please don't do stuff like this—to go off and make these kind of proclamations in public. It's negligent at best.
The repeated distinction between source code and "artifacts" in this context is pure make-believe. The license doesn't even have those words in it, let alone say something like "Redistribution and use in source form requires inclusion of this permission notice and the above copyright notice, but if you're just building a product and publishing it as non-source code artifacts instead of distributing source, then lol don't worry about it bro" (or whatever it is the people here seem to think).
The CodeMirror maintainer definitely expects people who build closed source stuff to include the notices that are in the CodeMirror LICENSE file. And anyone telling you the license doesn't require this (and e.g. this is a peculiarity of CodeMirror itself) is delusional.
And this was my understanding of how it works for artifacts. You don't have to attribute in the software itself, just the code.
Not sure if you were referring directly to me, but I don't think my comment was harmful. Others may have also been led astray and an exchange like this might be educational for them to read.
> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
> The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
I think that second part is relevant to the discussion.