Posted by Nicu Tofan on Mar 18, 2013; 6:14am
URL: https://forum.librecad.org/DWG-Support-by-Rallaz-tp5707705p5707711.html

Oh, I'm sure it can't be that bad. There must be some previous work that we can rely on.
http://en.wikipedia.org/wiki/.dwg#History_of_the_DWG_format
http://opendesign.com/files/guestdownloads/OpenDesign_Specification_for_.dwg_files.pdf
http://www.iwriteiam.nl/DWG12.html

And that's just from the first two pages of google results.