Word can secure your documents to a moderate degree. Choose Tools->Options, and then click the Security tab. To prevent unauthorized edits, type a password in the ‘Password to
modify’ box; to disallow unauthorized viewing, type a password in the ‘Password to open’ box. To permit editing (to fill in a form, for example, or to use tracked changes), click the Protect Document button and make your choices. But Word’s lockbox is easily picked. Try creating a watermarked PDF of your document with Docudesk’s deskPDF Professional. The tool can generate tamper-proof PDFs using 128-bit security that restricts viewing, copying, pasting, and printing.