HOW TO SET PASSWORD IN SOLID WORKS 2013 FILE ?
You could also export the model or assembly as a 3D PDF. Some people are unable to download and install the eDrawing viewer, but Acrobat is pretty common to find on most computers. PDF files also allow for different levels of protection, so you may be able to require a password to open the 3D PDF. The encryption used by most programs is often not the strongest though, and there are several "password recovery" tools that can easily bypass the "security" without the need to break a long password.