mysociety/alaveteli

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      <h3>Censor Rule Warnings</h3>

      <p>
        This does replace text in binary files, but for most formats only in a
        naive way. It works well on surprisingly many Word documents. Notably it
        doesn't even do UCS-2 (unicode sometimes used in Word). There is also
        special code which works on some PDFs. Please <strong>carefully check
        </strong> all attachments have changed in the way you expect, and
        haven't become corrupted.
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      <p>
        You may need to manually rebuild the search index afterwards. You can
        redact things by individual request or by user by adding the censor rule
        from the appropriate page. If you need to redact across a whole
        authority, it will be easy enough to make code changes to add it,
        so do ask.
      </p>

      <p>
        <strong>Regexp rules that are hard to process will really slow down
        request display.</strong> Please only use regexps if you really need to.
      </p>
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