[Zope] Logo Guidelines for Grok and Bluebream

Hi all, preparing a brochure about Zope and friends I would like to know whether there are any guidelines for using the Grok- and Bluebream-Logo. Am I right that neither Grok nor Bluebream are trademarks owned by the Zope Foundation? TIA -- Jan Ulrich Hasecke DZUG e.V. (Deutschsprachige Zope User Group)