Digital signatures let you identify any unauthorized changes made to
a document after it is signed. Documents may be signed several times and
by different persons. Certifying a PDF document ensures, in addition to
applying a digital signature, that it is encrypted so it can only be accessed
or changed by trusted recipients. Digital IDs are used to sign, encrypt
and decrypt documents.
To sign an open PDF document
Select Document > Sign & Certify > Sign Document or, on the Security
toolbar, click the down arrow next to the 
Sign or Certify Document tool and
choose Sign Document from
the drop-down menu.
Click with the 
cursor
and do one of the following:
In the Sign Document dialog box, select a Digital
ID from the list or click Add...
to browse for an existing Digital ID or create
a self-signed digital ID. Confirm the password
if the signature scheme includes password protection, then:
Click Save
or Save As ... for an
invisible signature to take effect, or
Click Next, configure the appearance, and click
Save or Save
As ... for a visible signature to take effect
To sign and certify an open PDF document
Select Document > Sign & Certify > Certify Document or, on the Security
toolbar, click the down arrow next to the
Sign or Certify Document button
and choose Certify Document
from the drop-down menu.
Click with the cursor
and do one of the following:
In the Certify Document dialog box, select a Digital
ID from the list or click Add...
to browse for an existing Digital ID or create
a self-signed digital ID. Confirm the password
if the signature scheme includes password protection. Specify allowed
actions by choosing from Allow no
changes, Allow form filling
only, Allow comments and form
filling, then:
Click Save
or Save As ... for an
invisible signature to take effect, or
Click Next, configure the appearance and click
Save or Save
As ... for a visible signature to take effect.
To sign and certify an open PDF document invisibly
Select Document > Sign & Certify > Certify Document Invisibly or, on
the Security toolbar, click the
down arrow next to the Sign
or Certify Document button and choose Certify
Document Invisibly from the drop-down menu.
In the Certify Document dialog box, select a Digital
ID from the list or click Add... to browse for an existing Digital
ID or create a self-signed
digital ID. Confirm the password
if the signature scheme includes password protection. Specify allowed
actions by choosing from Allow no changes, Allow form filling only,
Allow comments and form filling, and then Click Save
or Save As ... for your action
to take effect.
To use the Sign/Certify Panel for signing and certifying
These actions can be performed more conveniently with the Sign/Certify
Panel. Do one of the following to display it:
Select Document > Sign & Certify > Sign/Certify Panel.
Select View > Organizer Panels > Sign/Certify
.
In the View toolbar,
click the 
Organizer
Panels button and select Sign/Certify
from the drop-down list.
On the Security toolbar,
click the Sign
or Certify Document button.
To use an available signature scheme, select its
thumbnail in the panel and do one of the following
Drag it to the place on the page where you want to
locate it with original sizing.
Double-click with the Sign
or Certify Document cursor
on the page where you want it located with original sizing.
Draw a rectangle with the Sign
or Certify Document cursor
to contain the signature, resized to fit into the rectangle.
Note
The Sign/Certify panel
displays both visible and invisible signature schemes.
