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This is either brilliant or scary: Anthropic accidentally leaked the TS source code of Claude Code (which is closed source). Repos sharing the source are taken down with DMCA. BUT this repo rewrote the code using Python, and so it violates no copyright & cannot be taken down!

The repo: github.com/instructkr/c... The brilliance: copyright does not protect derived works. Rewriting TypeScript code in Python means copyright no longer applies. The scary thing: it can be done in trivial amount of time, with AI agents. This one was done with Codex.

Copyright absolutely does protect derivative works, like translations of a book to another human language. But yes, if you change things enough, it's considered a new work (e.g. GNU reimplementations of proprietary UNIX programs).

also, Anthropic doesn't feel like they would want to argue to expland derived works protection, if done with eg a coding AI agent (that is one of their biggest renveue generators!)