Most of the MDC content is available under the terms of the Creative Commons: Attribution-Sharealike license, with most code samples available under the terms of MIT license. See MDC:Copyrights for details.
If a page is under a license other than the Creative Commons: Attribution-Sharealike license, an Alternate License Block must be included at the bottom of each alternately-licensed page.
An example of this would be:
Copyright (c) (Year) by (Author Name). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later. (the latest version is presently available at http://www.opencontent.org/openpub/).