[teddyh]

> Copilot isn’t a derivative work in the sense these licenses usually are understood to mean

The phrase “derived work” is, IIUC, a phrase from copyright law. And you’d have a hard time convincing me that Copilot-generated code is not a derived work from its training data.

> And given that they’re open source code bases I expect licenses to explicitly disallow things, and consider anything not explicitly disallowed as permitted.

That is very much not how copyright and licences work. Copyright law gives the copyright holder the exclusive right to make copies of the work, making derived works, (and to do some other related things, like making a public performance of it, etc.), so to do any of those things, you need explicit permission, i.e. a license from the copyright holder to do it. A license is not a list of things you are forbidden to do; on the contrary, it is a list of things you are permitted to do, which you would not otherwise be legally allowed to do according to copyright law.

[skybrian]

Sure, but there are things you can do without a license because they're not copyright violations. You can read the work, learn from it, and sometimes make quotations under fair use.

This is a novel scenario. It seems unclear how the courts will interpret it? Never mind what we think, will they decide it's a derivative work, or is it a transformative use?

https://en.m.wikipedia.org/wiki/Transformative_use

[teddyh]

“Fair use” is, technically, not actually permitted by copyright law. ISTR that “fair use” is only a defense you can use when you are being sued for copyright violation.

Suppose we create a new AI image generator, and use as training input every image ever made of a Disney character (official images by Disney, that is, no fan art), including every frame of every Disney movie. Could we just use the output images of that AI however we wanted to? (Not withstanding trademarks.)

[skybrian]

Looks like there is case law that fictional characters are protected if they are "sufficiently delineated." I don't see how that applies to code, though.

https://en.m.wikipedia.org/wiki/Copyright_protection_for_fic...

[teddyh]

I guess we’ll find out.