"Nanosoft"
Russian developer of engineering software: nanoCAD 5,1,0
The program was initially distributed free of charge, but is now available only for a fee. Registration is strictly through their service, requiring a key and email address. The program is fully functional and opens all versions of nanoCAD and AutoCAD, as well as editing and saving in any version.

A license is sold (the program is included in an archive). If you don't know what this program is and don't know how to use it, please do not purchase the product: there will be no refunds and no training. If you experience any problems downloading or losing the file, please contact Kulashkalpak@gmail.com