Document.PasswordEncryptionKeyLength (Word)

Returns a Long indicating the key length of the algorithm Microsoft Word uses when encrypting documents with passwords.

Use the SetPasswordEncryptionOptions method to specify the key length Word uses when encrypting documents with passwords.

Sub PasswordSettings() 
 With ActiveDocument 
 If .PasswordEncryptionKeyLength < 40 Then 
 .SetPasswordEncryptionOptions _ 
 PasswordEncryptionProvider:="Microsoft RSA SChannel Cryptographic Provider", _ 
 PasswordEncryptionAlgorithm:="RC4", _ 
 PasswordEncryptionKeyLength:=56, _ 
 PasswordEncryptionFileProperties:=True 
 End If 
 End With 
End Sub