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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - implement Crypt filter"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=62800">62800</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>poppler-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>implement Crypt filter
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>Thomas.Freitag@alfa.de
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>general
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>poppler
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=77090" name="attach_77090" title="implement crypt filter">attachment 77090</a> <a href="attachment.cgi?id=77090&action=edit" title="implement crypt filter">[details]</a></span>
implement crypt filter

If I call i.e. pdfinfo -meta bug-poppler16092.pdf, I get an error message

Syntax Error (0): Unknown filter 'Crypt'

and the metadata is not printed. According to the spec the filter 'Crypt'
should just revert the decrypt filter:

(PDF 1.5) Decrypts data encrypted by a security handler, reproducing the data
as it was before encryption.

The attached patch implements it in that way.</pre>
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