diff --git a/BurnOutSharp/ProtectionType/TwentyOneStudios.cs b/BurnOutSharp/ProtectionType/TwentyOneStudios.cs
new file mode 100644
index 00000000..37347a6e
--- /dev/null
+++ b/BurnOutSharp/ProtectionType/TwentyOneStudios.cs
@@ -0,0 +1,15 @@
+namespace BurnOutSharp.ProtectionType
+{
+    public class TwentyOneStudios
+    {
+        public static string CheckContents(byte[] fileContent, bool includePosition = false)
+        {
+            // 2 + (char)0x00 + 1 + (char)0x00 + S + (char)0x00 + t + (char)0x00 + u + (char)0x00 + d + (char)0x00 + i + (char)0x00 + o + (char)0x00 + s + (char)0x00 +   + (char)0x00 + A + (char)0x00 + c + (char)0x00 + t + (char)0x00 + i + (char)0x00 + v + (char)0x00 + a + (char)0x00 + t + (char)0x00 + i + (char)0x00 + o + (char)0x00 + n + (char)0x00
+            byte[] check = new byte[] { 0x32, 0x00, 0x31, 0x00, 0x53, 0x00, 0x74, 0x00, 0x75, 0x00, 0x64, 0x00, 0x69, 0x00, 0x6F, 0x00, 0x73, 0x00, 0x20, 0x00, 0x41, 0x00, 0x63, 0x00, 0x74, 0x00, 0x69, 0x00, 0x76, 0x00, 0x61, 0x00, 0x74, 0x00, 0x69, 0x00, 0x6F, 0x00, 0x6E, 0x00 };
+            if (fileContent.Contains(check, out int position))
+                return "21Studios Online Activation" + (includePosition ? $" (Index {position})" : string.Empty);
+
+            return null;
+        }
+    }
+}