old_contents: from django.conf.urls import url
  
  from ..views import (
      TagCreate, TagDelete, TagDetail, TagList,
      TagUpdate)
  
  urlpatterns = [
      url(r'^$',
          TagList.as_view(),
          name='organizer_tag_list'),
      url(r'^create/$',
          TagCreate.as_view(),
          name='organizer_tag_create'),
      url(r'^(?P<slug>[\w\-]+)/$',
          TagDetail.as_view(),
          name='organizer_tag_detail'),
      url(r'^(?P<slug>[\w-]+)/delete/$',
          TagDelete.as_view(),
          name='organizer_tag_delete'),
      url(r'^(?P<slug>[\w\-]+)/update/$',
          TagUpdate.as_view(),
          name='organizer_tag_update'),
  ]
  
new_contents: from django.conf.urls import url
  from django.contrib.auth.decorators import \
      login_required
  
  from ..views import (
      TagCreate, TagDelete, TagDetail, TagList,
      TagUpdate)
  
  urlpatterns = [
      url(r'^$',
          TagList.as_view(),
          name='organizer_tag_list'),
      url(r'^create/$',
          login_required(
              TagCreate.as_view()),
          name='organizer_tag_create'),
      url(r'^(?P<slug>[\w\-]+)/$',
          TagDetail.as_view(),
          name='organizer_tag_detail'),
      url(r'^(?P<slug>[\w-]+)/delete/$',
          TagDelete.as_view(),
          name='organizer_tag_delete'),
      url(r'^(?P<slug>[\w\-]+)/update/$',
          TagUpdate.as_view(),
          name='organizer_tag_update'),
  ]
  
subject: Use login_required decorator in URL pattern.