Microsoft Office Tutorials and References
In Depth Information
Using digital signatures
Figure 4-11 Double-click the signature line object to display the Sign dialog box.
You can simply type your name in the Sign dialog box, or you can select a picture to use as
your signature. It can be clip art or any picture, perhaps even a scan of your actual
signature. You can add information about yourself to the signature by clicking the Details
button. Once signed, the document is set to Read-Only; any edits made to the workbook will
invalidate the signature, which, of course, is the point. After you apply a signature, a
message bar appears in the workbook with a “Marked as Final” message, like the one shown in
Figure 4-13.
Creating your own digital signature lets you verify only the authenticity of your own
documents, and even then only on your own computer. If you would like to increase the
apparent trustworthiness of your workbooks by purchasing a verifiable signature, click the
Insert tab, click the Text button, click Signature Line, and then click Add Signature Services.
This opens a webpage where you can select and order one from a number of third-party
vendors.
You can also add a digital signature by clicking the File tab, clicking Info, clicking Protect
Workbook, and then clicking Add A Digital Signature to display the dialog box shown in
Figure 4-12.
The Commitment Type list shows four options: None; Created And Approved This
Document; Created This Document; and Approved This Document. You can also add a note in
the Purpose For Signing This Document box. When you’re finished, click the Sign button to
sign the workbook.
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