Ranvier is MIT licensed, you can see the full text of our license in the LICENSE.txt file in the root of the repo.
Unlike the Diku license Ranvier has no license requirement that you include credits on the login screen. However, Ranvier is a labor of love and a lot of effort. As such, it would be much appreciated if you included the credits listed below in your game in a command, helpfile, or if you really want right on the login screen.
If you've made contributions to Ranvier and wish to have your name added to this list feel free to send a pull request on github.
Shawn Biddle (github.com/shawncplus)
A full list of contributors can be found at https://github.com/RanvierMUD/ranviermud/graphs/contributors