docs: def anonymize(self):
          """ According to PS 3.15-2008, basic application level
          De-Indentification of a DICOM file requires replacing the values of a
          set of data elements"""
          self._anon_obj = gdcm.Anonymizer()
          self._anon_obj.SetFile(self._file)
          self._anon_obj.RemoveGroupLength()
  
          if self._anon_tags is None:
              self._anon_tags = get_anon_tags()
  
          for tag in self._anon_tags:
              cur_tag = tag['Tag'].replace("(", "")
              cur_tag = cur_tag.replace(")", "")
              name = tag["Attribute Name"].replace(" ", "").encode("utf8")
              group, element = cur_tag.split(",", 1)
  
              # TODO expand this 50xx, 60xx, gggg, eeee
              if ("xx" not in group
                  and "gggg" not in group
                  and "eeee" not in group):
                      group = int(group, 16)
                      element = int(element, 16)
                      if self.find(group=group, element=element):
                          self._anon_obj.Replace(
                              gdcm.Tag(group, element), "Anon" + name)
  
          return self._anon_obj