diff --git a/src/ReceiveCommands.cc b/src/ReceiveCommands.cc
index 1c10a7c6..960810db 100644
--- a/src/ReceiveCommands.cc
+++ b/src/ReceiveCommands.cc
@@ -5,6 +5,7 @@
 
 #include <memory>
 #include <phosg/Filesystem.hh>
+#include <phosg/Hash.hh>
 #include <phosg/Network.hh>
 #include <phosg/Random.hh>
 #include <phosg/Strings.hh>
@@ -331,10 +332,17 @@ void process_login_bb(shared_ptr<ServerState> s, shared_ptr<Client> c,
     auto l = s->license_manager->verify_bb(cmd.username, cmd.password);
     c->set_license(l);
   } catch (const exception& e) {
-    u16string message = u"Login failed: " + decode_sjis(e.what());
-    send_message_box(c, message.c_str());
-    c->should_disconnect = true;
-    return;
+    if (!s->allow_unregistered_users) {
+      u16string message = u"Login failed: " + decode_sjis(e.what());
+      send_message_box(c, message.c_str());
+      c->should_disconnect = true;
+      return;
+    } else {
+      shared_ptr<License> l = LicenseManager::create_license_bb(
+          fnv1a32(cmd.username), cmd.username, cmd.password, true);
+      s->license_manager->add(l);
+      c->set_license(l);
+    }
   }
 
   try {
diff --git a/system/config.example.json b/system/config.example.json
index bbc3b74a..4dc3f40f 100644
--- a/system/config.example.json
+++ b/system/config.example.json
@@ -141,10 +141,13 @@
   },
 
   // By default, the server only allows users who are registered in the license
-  // file to connect. By enabling this option, all non-BB users will be allowed
-  // to connect. This option has no effect for Blue Burst clients; they are
-  // always required to be registered before connecting. Keep in mind that
-  // unregistered users cannot be banned!
+  // file to connect. By enabling this option, all users will be allowed to
+  // connect. Each time a user connects with an unregistered license (serial
+  // number / access key combination, or username/password combination on BB), a
+  // temporary license is created for them, which lasts until the server is
+  // shut down. This license is not saved to the license file. For BB, player
+  // and account data is still saved on the server, even for users with
+  // temporary licenses.
   "AllowUnregisteredUsers": false,
 
   // User to run the server as. If present, newserv will attempt to switch to