The Parrot author could add a single sentence "based on X" somewhere. Not quite sufficient, but close. From the license: "...subject to the following conditi

The Parrot author could add a single sentence "based on X" somewhere. Not quite sufficient, but close. From the license: "...subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software." One could question the ethical aspects Something like taking an MIT-based project and just rebranding it - or basically just rebranding it - sure. It does put a bad taste in one's mouth. And that does seem to be what the other project did. (...So far. Maybe they intend to go a different way with the language, and we just happen to see it at this primordial state because it's being developed in public. Who knows.)