Information Technology Reference
In-Depth Information
9. Click OK to close the Document Properties dialog box; click OK to close the message dialog box
that states you have to save the document in order to save the security settings.
10. Click OK to dismiss the message and return to the program.
Often, saving a document using an alternate name makes it easier to work with the document in the
future: it is simpler to make changes to a document and then save with password protection than it is to
remove existing protection before making changes and reapplying the security again.
After saving, close and reopen the file to test the protection. Based on the selected security settings,
such as not allowing printing, you will see that many of the program commands are disabled. A protected
document displays a security icon at the lower left of the program window. Move your cursor over the icon
to display a tooltip explaining the security applied (Figure 10.3).
Figure 10.3 A protected file displays a security icon
Removing or Editing Password Security
Password protection can be removed simply from a protected document.
With the document open in Acrobat, follow these steps to remove the password security:
1. Choose File > Document Properties to open the Document Properties dialog box, and then select the
Security tab.
2. Click the Security Method drop-down arrow and choose No Security from the list; a confirmation
dialog box opens.
3. Type the password in the confirmation dialog box, and click OK to confirm the deletion and close
the dialog box; click OK again to dismiss the Document Properties dialog box.
4. Save the file to preserve the security changes.
To edit existing protection, in the Document Properties dialog, click Edit Settings to open the same
options used to apply the initial document passwords, make modifications as required, and resave the file.
Digital Signatures
Just as your signature on a document attests to your understanding and acceptance of the content you have
signed, a digital signature can be applied to a document in the same way. A digital certificate is akin to a
signature card at the bank: you sign the card and the bank uses it to verify the signature on a check.
Your signature in the digital world is a unique mathematical equation. To be valid in commerce, a third
party must keep a copy of your Public Key to verify your signature. There are several companies, such as
Entrust, RSA and VeriSign, that issue and manage digital signatures.
There are additional ways to apply security, of course. For instance, the US Navy is using a digital ID
that also has a biometric component, and analyses a signature written on a signature pad.
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