sdcdc is not part of the GNU Project.
sdcdc is a program to generate different CD labels and front-covers for the different systems, architectures and versions of the Debian software distribution in different languages.
UPDATE: sdcdc is unmaintained. Please contact me to apply for maintaining it.
You can download sdcdc from <http://savannah.nongnu.org/files/?group=sdcdc>.
Example mini image: <sdcdc-mini-example.jpg>.
The documentation is included in the sdcdc package in info format, including texinfo sources too.
It is avaiable online in HTML format too: see the sdcdc manual.