That would be MIT press (sometimes). For example https://mitpress.mit.edu/books/deep-learning https://mitpress.mit.edu/books/deep-learning is available at http:

That would be MIT press (sometimes). For example https://mitpress.mit.edu/books/deep-learning https://mitpress.mit.edu/books/deep-learning is available at http://www.deeplearningbook.org/ http://www.deeplearningbook.org/ , but you can't get DRM-free ePubs or PDFs.