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But calibre can convert topaz files. So there must exist informations about this format.
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As far as I know... no... calibre
can't convert Topaz. It can handle the metadata for Topaz, but it can't convert it. I suspect that you may be using a certain plugin that automatically converts the OCR'ed text of DRM'ed Topaz files to xhtml (technically an HTMLZ archive) when you import a Topaz file into calibre. Calibre can then easily convert HTMLZ to other formats.
Any clues to the Topaz format will likely be found in the source code of that plugin.