diff --git a/files/permissions.py b/files/permissions.py
new file mode 100644
index 0000000..cf56bca
--- /dev/null
+++ b/files/permissions.py
@@ -0,0 +1,22 @@
+from rolepermissions.permissions import register_object_checker
+from amadeus.roles import SystemAdmin
+
+@register_object_checker()
+def edit_file(role, user, file):
+    if (role == SystemAdmin):
+        return True
+
+    if (user in file.topic.subject.professors.all()):
+        return True
+
+    return False
+
+@register_object_checker()
+def delete_file(role, user, file):
+    if (role == SystemAdmin):
+        return True
+
+    if (user in file.topic.subject.professors.all()):
+        return True
+
+    return False
\ No newline at end of file
diff --git a/files/views.py b/files/views.py
index 56c18ca..5a754f8 100644
--- a/files/views.py
+++ b/files/views.py
@@ -181,7 +181,7 @@ class UpdateFile(LoginRequiredMixin, HasRoleMixin, LogMixin, generic.UpdateView)
 
 	def dispatch(self, *args, **kwargs):
 		file = get_object_or_404(TopicFile, slug = self.kwargs.get('slug'))
-		if(not has_object_permission('edit_file', self.request.user, file) or not(self.request.user in file.topic.subject.professors.all())):
+		if(not has_object_permission('edit_file', self.request.user, file) and not(self.request.user in file.topic.subject.professors.all())):
 			return self.handle_no_permission()
 		return super(UpdateFile, self).dispatch(*args, **kwargs)
 
--
libgit2 0.21.2