[xep-support] PDF redaction strategy

I've been looking for a way to mark certain items for redaction. I
would basically like to add 'redact="true"' to any element that should
be redacted. When the PDF is generated any elements marked for
redaction are displayed as a black box whose sides are aligned with
the content area of the element that would otherwise have been rendered.

The closest I've come is a suggestion on docbook-apps for the
following...

<xsl:template match="text()[ancestor::*[@redact='yes']]">
        <xsl:value-of select="translate
(.,'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890-_=+!
@#$%^&*();':"<>,./?',
                        'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
')"/>
        <!-- Add other chars, e.g. accented chars and other languages, as
needed -->
</xsl:template>

The output of this would be printed black on black. There are a couple
of drawback...

1) It doesn't handle elements like <imagedata/>
2) It doesn't preserve the actual flow of the document, when compared
to a non-redacted version. This is caused by a series of replacement
letters will almost never match the content area of the "regular"
output.

Has anyone ever used XEP for something similar to this? I'm thinking
that perhaps between my customization layer and XEP, I could tell XEP
to render the element as a black box.

Thoughts?

-David
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Received on Wed Jun 24 20:45:06 2009