diff --git a/src/xenia/emulator.cc b/src/xenia/emulator.cc
index ccf83370f..35c1979cc 100644
--- a/src/xenia/emulator.cc
+++ b/src/xenia/emulator.cc
@@ -312,6 +312,7 @@ X_STATUS Emulator::LaunchXexFile(std::wstring path) {
   auto file_name = xe::find_name_from_path(path);
 
   // Launch the game.
+  title_packaged_ = false;
   std::string fs_path = "game:\\" + xe::to_string(file_name);
   return CompleteLaunch(path, fs_path);
 }
@@ -335,6 +336,7 @@ X_STATUS Emulator::LaunchDiscImage(std::wstring path) {
   file_system_->RegisterSymbolicLink("d:", mount_path);
 
   // Launch the game.
+  title_packaged_ = false;
   auto module_path(FindLaunchModule());
   return CompleteLaunch(path, module_path);
 }
@@ -358,6 +360,7 @@ X_STATUS Emulator::LaunchStfsContainer(std::wstring path) {
   file_system_->RegisterSymbolicLink("d:", mount_path);
 
   // Launch the game.
+  title_packaged_ = true;
   auto module_path(FindLaunchModule());
   return CompleteLaunch(path, module_path);
 }
diff --git a/src/xenia/emulator.h b/src/xenia/emulator.h
index f973b6220..e51bb216f 100644
--- a/src/xenia/emulator.h
+++ b/src/xenia/emulator.h
@@ -70,6 +70,9 @@ class Emulator {
   // Are we currently running a title?
   bool is_title_open() const { return title_id_ != 0; }
 
+  // Is the title running from an STFS package?
+  bool is_title_packaged() const { return title_packaged_; }
+
   // Window used for displaying graphical output.
   ui::Window* display_window() const { return display_window_; }
 
@@ -184,6 +187,7 @@ class Emulator {
   std::unique_ptr<kernel::KernelState> kernel_state_;
   kernel::object_ref<kernel::XThread> main_thread_;
   uint32_t title_id_;  // Currently running title ID
+  bool title_packaged_ = false;  // Is title running from a package?
 
   bool paused_;
   bool restoring_;
diff --git a/src/xenia/kernel/xam/xam_content.cc b/src/xenia/kernel/xam/xam_content.cc
index 24df8ae9e..848b38f88 100644
--- a/src/xenia/kernel/xam/xam_content.cc
+++ b/src/xenia/kernel/xam/xam_content.cc
@@ -68,6 +68,17 @@ dword_result_t XamContentGetLicenseMask(lpdword_t mask_ptr,
   // if the game is purchased or not.
   *mask_ptr = static_cast<uint32_t>(cvars::license_mask);
 
+  // Halo CEA calls this function to check if it's being ran from a package
+  // (maybe to know if it's a demo or something?)
+  // If we don't error it'll skip a bunch of things (DVD check/cache mount/...)
+  // So make sure to error if it's not running from package:
+  if (!kernel_state()->emulator()->is_title_packaged()) {
+    // Hack to still allow arcade titles get the license mask:
+    if ((kernel_state()->emulator()->title_id() & 0xFFFF0000) != 0x58410000) {
+      return X_E_ACCESS_DENIED;
+    }
+  }
+
   if (overlapped_ptr) {
     kernel_state()->CompleteOverlappedImmediate(overlapped_ptr,
                                                 X_ERROR_SUCCESS);
diff --git a/src/xenia/xbox.h b/src/xenia/xbox.h
index 90bc1a328..da801a7bf 100644
--- a/src/xenia/xbox.h
+++ b/src/xenia/xbox.h
@@ -111,6 +111,7 @@ typedef uint32_t X_HRESULT;
 
 #define X_E_FALSE                               static_cast<X_HRESULT>(0x80000000L)
 #define X_E_SUCCESS                             X_HRESULT_FROM_WIN32(X_ERROR_SUCCESS)
+#define X_E_ACCESS_DENIED                       X_HRESULT_FROM_WIN32(X_ERROR_ACCESS_DENIED)
 #define X_E_INVALIDARG                          X_HRESULT_FROM_WIN32(X_ERROR_INVALID_PARAMETER)
 #define X_E_DEVICE_NOT_CONNECTED                X_HRESULT_FROM_WIN32(X_ERROR_DEVICE_NOT_CONNECTED)
 #define X_E_NOTFOUND                            X_HRESULT_FROM_WIN32(X_ERROR_NOT_FOUND)