OpenOffice.org OpenOffice - 3.0 User's Guide Page 242

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2) In your e-mail program, enter the recipient, subject and any text
you want to add, then send the e-mail.
File > Send > E-mail as OpenDocument Presentation has the
same effect.
If you choose E-mail as Microsoft PowerPoint, OOo first creates a
.PPT file and then opens your e-mail program with the .PPT file
attached. The .PPT file is not saved on your computer.
Similarly, if you choose E-mail as PDF, OOo first creates a PDF using
your default PDF settings (as when using the Export Directly as PDF
toolbar button) and then opens your e-mail program with the .PDF file
attached. The PDF file is not saved on your computer.
Tip
If you want to keep a copy of the .PPT or .PDF file as well as e-
mailing it to someone, first save or export the presentation into
the required format, then attach it to an e-mail in the usual way.
Digital signing of documents
To sign a document digitally, you need a personal key, the certificate. A
personal key is stored on your computer as a combination of a private
key, which must be kept secret, and a public key, which you add to your
documents when you sign them. You can get a certificate from a
certification authority, which may be a private company or a
governmental institution.
When you apply a digital signature to a document, a kind of checksum
is computed from the document’s content plus your personal key. The
checksum and your public key are stored together with the document.
When someone later opens the document on any computer with a
recent version of OpenOffice.org, the program will compute the
checksum again and compare it with the stored checksum. If both are
the same, the program will signal that you see the original, unchanged
document. In addition, the program can show you the public key
information from the certificate. You can compare the public key with
the public key that is published on the web site of the certificate
authority.
Whenever someone changes something in the document, this change
breaks the digital signature.
On Windows operating systems, the Windows features of validating a
signature are used. On Solaris and Linux systems, files that are
supplied by Thunderbird, Mozilla or Firefox are used. For a more
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