This is the open source for DIN Schablonierschrift. For more info on the font or a simple download, visit http://www.sendung.de/dinschablonierschrift/
If you like, you can grab the source from the "source" folder and edit it in FontForge. FontForge is free and Open Source and runs on multiple platforms.
Feel free to improve the font by adding characters, hints, kerning pairs etc. I welcome your pull requests!
Creative Commons Share-Alike - http://creativecommons.org/licenses/sa/1.0/