Protection of the information in a complex CAD system of renovation of   industrial firms
  The threats to security of the information originating owing to involuntary operations of the users of a CAD, and methods of its protection implemented in a complex CAD system of renovation of firms are considered: rollback, autosave, automatic backup copying and electronic subscript. The specificity of a complex CAD is reflected in necessity of rollback and autosave both of the draw and the parametric representations of its parts, which are the information models of the problem-oriented extensions of the CAD 
Vladimir V. Migunov, Rustem R. Kafiyatullov