diff --git a/learning_log/settings.py b/learning_log/settings.py
index 2dc9e65..df5a2de 100644
--- a/learning_log/settings.py
+++ b/learning_log/settings.py
@@ -122,3 +122,5 @@
 # https://docs.djangoproject.com/en/1.11/howto/static-files/
 
 STATIC_URL = '/static/'
+
+LOGIN_URL = 'users/login/'
diff --git a/learning_logs/models.py b/learning_logs/models.py
index ab92a3f..7ae9e84 100644
--- a/learning_logs/models.py
+++ b/learning_logs/models.py
@@ -1,9 +1,11 @@
 from django.db import models
+from django.contrib.auth.models import User
 
 class Topic(models.Model):
     """A topic the user is learning about"""
     text = models.CharField(max_length=200)
     date_added = models.DateTimeField(auto_now_add=True)
+    owner = models.ForeignKey(User)
 
     def __str__(self):
         return self.text
diff --git a/learning_logs/views.py b/learning_logs/views.py
index 16f4a86..017e2ff 100644
--- a/learning_logs/views.py
+++ b/learning_logs/views.py
@@ -1,6 +1,7 @@
 from django.shortcuts import render
-from django.http import HttpResponseRedirect
+from django.http import HttpResponseRedirect, Http404
 from django.core.urlresolvers import reverse
+from django.contrib.auth.decorators import login_required
 
 from learning_logs.models import Topic, Entry
 from .forms import TopicForm, EntryForm
@@ -10,20 +11,24 @@ def index(request):
     """the home page for learning_log"""
     return render(request, 'learning_logs/index.html')
 
+@login_required
 def topics(request):
     """Show all topics"""
-    topics = Topic.objects.order_by('date_added')
+    topics = Topic.objects.filter(owner=request.user).order_by('date_added')
     context = {'topics': topics}
 
     return render(request, 'learning_logs/topics.html', context)
 
+@login_required
 def topic(request, topic_id):
     """Show a single topic and all of its entries"""
     topic = Topic.objects.get(id=topic_id)
+    check_topic_owner(request)
     entries = topic.entry_set.order_by('-date_added')
     context = {'topic': topic, 'entries': entries}
     return render(request, 'learning_logs/topic.html', context)
 
+@login_required
 def new_topic(request):
     """Add a new topic"""
     if request.method != 'POST':
@@ -33,12 +38,15 @@ def new_topic(request):
         # POST data submitted; process data
         form = TopicForm(data=request.POST)
         if form.is_valid():
-            form.save()
+            new_topic = form.save(commit=False)
+            new_topic.owner = request.user
+            new_topic.save()
             return HttpResponseRedirect(reverse('learning_logs:topics'))
 
     context = {'form': form}
     return render(request, 'learning_logs/new_topic.html', context)
 
+@login_required
 def new_entry(request, topic_id):
     """Add a new entry for a particular topic."""
     topic = Topic.objects.get(id=topic_id)
@@ -50,6 +58,7 @@ def new_entry(request, topic_id):
         #POST data submitted; process data.
         form = EntryForm(data=request.POST)
         if form.is_valid():
+            check_topic_owner(request)
             new_entry = form.save(commit=False)
             new_entry.topic = topic
             new_entry.save()
@@ -59,10 +68,12 @@ def new_entry(request, topic_id):
     context = {'topic':topic, 'form':form}
     return render(request, 'learning_logs/new_entry.html', context)
 
+@login_required
 def edit_entry(request, entry_id):
     """Edit an existing entry"""
     entry = Entry.objects.get(id=entry_id)
     topic = entry.topic
+    check_topic_owner(request)
 
     if request.method != 'POST':
         form = EntryForm(instance=entry)
@@ -74,4 +85,8 @@ def edit_entry(request, entry_id):
                                                 args=[topic.id]))
 
     context = {'entry': entry, 'topic': topic, 'form': form}
-    return render(request, 'learning_logs/edit_entry.html', context)
\ No newline at end of file
+    return render(request, 'learning_logs/edit_entry.html', context)
+
+def check_topic_owner(request):
+    if topic.owner != request.user:
+        raise Http404
\ No newline at end of file