Sounds vaguely like the paper “textbooks are all you need”? Though they are not explicitly trying to remove the copyright taint. https://arxiv.org/abs/2306.116

Sounds vaguely like the paper “textbooks are all you need”? Though they are not explicitly trying to remove the copyright taint. https://arxiv.org/abs/2306.11644 https://arxiv.org/abs/2306.11644