11.2.1 for Windows

Foxit PDF Editor
Chapter 11: Signature User Manual
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the related area in the document.
Compare versions of a digitally signed document
For a digitally signed document (which might have been signed several times), you can
view the differences (if any) between a signed version and the current version you
have.
To compare a signed document with the current version, do as the following:
1. Open the current version you have with Foxit PDF Editor.
2. Right-click the desired signature in the document pane with the Hand command
and choose Compare Signed Version to Current Version from the context
menu.
3. A PDF document with the comparison result named “Untitled.pdf*” will be
automatically created and opened in a new tab within Foxit PDF Editor, and the
Compare Results tab appears on the ribbon. The results document arranges
pages side by side showing the two versions with the changes marked by different
icons and colors. The first page and the second page show a summary and details
of the comparison results respectively. See also Compare PDF Files.
If the document has not been modified since the selected signature was applied,
a prompt appears saying you are already viewing the version covered by the
selected signature.
Certify a PDF (Pro Only)
Only the author can certify his/her own PDF documents. The author can specify what
changes can be made to the file after certifying. Whenever approved changes are
made, the certificate remains valid. If a reader tries to make changes you haven't
allowed, the certificate is invalidated and any subsequent users will be notified that
the document was tampered with.
To certify your PDF, please do the following:
1. Open your PDF document you want to certify.
2. Select Protect > Sign & Certify > Certify with visible signature/Certify without
visible signature.
3. Press and hold mouse button down, drag to select an area on the document where
you want the signature to appear.
4. In the pop-up Certify Document dialog box, choose a digital ID. If you don’t find
the specified digital ID, you need to get a digital ID from a third-party provider or