ADoBe ACRoBAT 9 CLAssRooM In A BooK
Signing a document electronically oﬀers several advantages, not least of which is
that you can email the signed document rather than having to fax it or send it by
courier. Although digitally signing a document doesn’t necessarily prevent people
from changing the document, it does allow you to track any changes made after the
signature is added and revert to the signed version if necessary. (You can prevent
users from changing your document by applying appropriate security to the docu-
ment, as you’ll see later in this lesson.)
• Choose File > Open. Select Lotion.pdf in the Lesson08 folder, and click Open.
周en choose File > Save As, rename the ﬁle Lotion1.pdf, and save it in the
creating digital ids
A digital ID is like a driver’s license or passport. It proves your identity to people
with whom you communicate electronically. A digital ID usually contains your
name and email address, the name of the company that issued your digital ID, a
serial number, and an expiration date.
A digital ID lets you create a digital signature or decrypt a PDF document that has
been encrypted. You can create more than one digital ID to reﬂect diﬀerent roles
in your life. For this section of the lesson, you’ll create a digital ID for T. Simpson,
Director of Advertising.
1 Choose Advanced > Security Settings.
2 In the Security Settings dialog box, select Digital
IDs in the left pane. 周en click the Add ID
You’ll create a self-signed digital ID. With a self-signed ID, you share your signature
information with other users using a public certiﬁcate. (A certiﬁcate is a conﬁrma-
tion of your digital ID and contains information used to protect data.) While this
method is adequate for most unoﬃcial exchanges, a more secure approach is to
obtain a digital ID from a third-party provider.
3 In the Add Digital ID dialog box, select A New Digital ID I Want To Create Now.
If you’re working in Mac OS, skip to step 5. If you’re working in Windows, you’ll
choose where to store your digital ID. 周e PKCS#12 Digital ID File option stores the
information in a ﬁle that you can share with others. A Windows Default Certiﬁcate
Digital ID is stored in the Windows Certiﬁcate Store. Because you want to easily
share your digital ID with colleagues, you’ll use the PKCS#12 option.
4 Make sure that New PKCS#12 Digital File ID is selected, and click Next.
Now you’ll enter your personal information.