Hi, Joe,
In general, the security of any document -- in any program, on any
computer -- is fair to poor. If a person can see the document on their
computer, and they're determined to make an altered copy, they may be able
to circumvent your "security" by at least one of these methods:
- Inserting your document into an unprotected one and altering that.
- Copying your text and pasting it into a less restrictive program.
- Printing your document, scanning it into an Optical Character Recognition
program that creates an unprotected document, and altering that.
- Reading your document and retyping it with changes.
The only way to secure the document completely is to prevent such a person
from ever seeing it.
Charles's suggestion involves going to Tools > Protect Document and
selecting "Protect for forms". This is no more secure than other methods.
If you create a pdf file from your document (using Adobe Acrobat or a
similar program), you can set options that will prevent the average user
from printing it or using the mouse and clipboard to make a copy of it.
However, there are programs that will (more or less successfully) convert
the pdf file back into an unprotected Word file. Also, there is still the
read-and-retype method.
The lengths to which you must go to protect your document depend on how
paranoid you are. In the worst case, don't use any electronic storage
method, and be careful about who can get and read your document. Otherwise,
be reasonable.