I am writing some code to edit and convert gerber files into a useful format. (If the bloody software won't do what I want, then I'll fix it myself!) Google for "The gerber file format specification" and you find that there's a DMCA complaint removing something (that's strange). Investigate further and you'll find it is in a complaint which seems to deal with people posting links to some German TV show. Maybe they were making PCBs in that TV show?!?!?!