<td>ImageMagick docs claim it is thread safe since version 5.2.2 (see <a href="http://www.cise.ufl.edu/depot/www/ImageMagick/www/Changelog.html">Change log</a>).
<td>PDFLib docs claim it is thread safe; changes.txt indicates it
has been partially thread-safe since V1.91: <a href="http://www.pdflib.com/products/pdflib/index.html">http://www.pdflib.com/products/pdflib/index.html</a>.</td></tr>
<td>Relies upon thread-safe zalloc and zfree functions Default is to
use libc's calloc/free which are thread-safe.</td></tr>
</table>
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