Yes, and Microsoft donated the characters and both books to CNCF, which relicensed them all CC-BY. More info and links to HTML, PDF, and source of the books at

Yes, and Microsoft donated the characters and both books to CNCF, which relicensed them all CC-BY. More info and links to HTML, PDF, and source of the books at https://phippy.io https://phippy.io. (Disclosure: I'm executive director of CNCF and helped arrange the donation and relicensing.)