code: public CmsUUID addForbiddenParentFolder(String parentFolder, String reason) {
  
          CmsUUID id = new CmsUUID();
          m_forbiddenParentFolders.put(id, new ForbiddenFolderEntry(parentFolder, reason));
          return id;
      }
docs: Adds a forbidden parent folder.<p>
  
  @param parentFolder the forbidden parent folder
  @param reason the reason why publishing is not allowed
  @return an ID which can be used later to remove the forbidden parent folder