Passwords 
When you publish a SolidWorks
eDrawings file from your CAD application, you can
assign a password to protect the eDrawings file.
You must have SolidWorks eDrawings Professional installed
to be able to protect eDrawings files with passwords.
You can add a password to new or existing eDrawings
files.
You can open password-protected eDrawings files
using the complimentary SolidWorks
eDrawings Viewer, provided you have the correct
password.
Once protected, the password cannot be removed
from the eDrawings file. The password is carried over when you save a
protected eDrawings file as another file name.
To add a password to a document
in SolidWorks eDrawings Professional:
Click File, Password.
In the
dialog box, select Password Required
to Open Document, then type a password.
Type the
same password for Confirm Password,
then click OK.
Click Save.
To add a password to an eDrawings file from your CAD
application:
Click File,
Save As.
Select the eDrawings file type in Save
as type.
Click Password.
In the dialog box, select Password
Required to Open Document, then type a password.
Type the same password for Confirm
Password, then click OK.
Click Save.
To open the password-protected eDrawings file in the SolidWorks
eDrawings Viewer:
In the eDrawings Viewer, open the eDrawings file.
In the Password
dialog box, type the correct password for Enter
Password.
Click OK.