If not mentioned otherwise these licenses will apply for my project:
arduino board: well, I gues that's pretty well documented by arduino.cc and know. Any custom/special board that will come from my project will therefor published under the same license (Creative Commons Attribution Share-Alike)
code/source code: all code generated for this project will be released under the GNU/GPLv3. Code written by other will be marked in the comment/head section.
pictures: all pictures are licensed under the CCbySA
The DCF77 receiver: the one I use so far is made by "Kundo xt" for "Reichelt Elektroni" here in germany. From the documents for it I couldn't firgure out which kind of license it gas. This is to be done.