diff --git a/IPA.Injector/Injector.cs b/IPA.Injector/Injector.cs
index 09f91444..4b1458e6 100644
--- a/IPA.Injector/Injector.cs
+++ b/IPA.Injector/Injector.cs
@@ -38,8 +38,11 @@ namespace IPA.Injector
 
                 loader.Debug("Prepping bootstrapper");
 
-                // // This will load Mono.Cecil
+                // This will load Mono.Cecil
                 InstallBootstrapPatch();
+
+                // loads Assembly-CSharp-firstpass
+                PiracyChecks();
             }
             catch (Exception e)
             {
@@ -143,6 +146,14 @@ namespace IPA.Injector
             #endregion
         }
 
+        private static void PiracyChecks()
+        {
+            if (Utilities.AntiPiracy.PiracyChecks.IsPirated)
+            {
+                log.Critical("You are using a pirated copy of the game! You will not recieve support for any mods.");
+            }
+        }
+
         private static bool bootstrapped = false;
         private static void CreateBootstrapper()
         {
diff --git a/IPA.Loader/Utilities/AntiPiracy.cs b/IPA.Loader/Utilities/AntiPiracy.cs
new file mode 100644
index 00000000..d171cd4d
--- /dev/null
+++ b/IPA.Loader/Utilities/AntiPiracy.cs
@@ -0,0 +1,76 @@
+using System;
+using System.IO;
+using UnityEngine;
+using Steamworks;
+
+namespace IPA.Utilities.AntiPiracy
+{
+    /// <summary>
+    /// Provides checks for whether or not the game is pirated.
+    /// </summary>
+    public static class PiracyChecks
+    {
+        /// <summary>
+        /// Runs through a list of checks to detect whether a game is pirated
+        /// </summary>
+        /// <returns></returns>
+        public static bool IsPirated
+        {
+            get
+            {
+                // Check for spoofed Steam Client
+                if (BeatSaber.ReleaseType == BeatSaber.Release.Steam && IsSpoofedSteam())
+                    return true;
+
+                // Check for the presence of known pirated files
+                if (HasKnownFiles())
+                    return true;
+
+                // If we get here, probably not a pirate
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Check common Steam Emulator values for red flags
+        /// </summary>
+        /// <returns></returns>
+        static bool IsSpoofedSteam()
+        {
+            // Always resolves to "IGGGAMES"
+            string userName = SteamFriends.GetFriendPersonaName(SteamUser.GetSteamID());
+
+            // Always resolves to "SteamFriends"
+            string friendName = SteamFriends.GetFriendPersonaName(new CSteamID(76561198042581607));
+
+            // Return if they both resolve to known spoofed values
+            return userName == "IGGGAMES" && friendName == "SteamFriends";
+        }
+
+        /// <summary>
+        /// Check for files that are present in pirated copies
+        /// </summary>
+        /// <returns></returns>
+        static bool HasKnownFiles()
+        {
+            // All known files
+            string[] paths = new string[]
+            {
+                Path.Combine(Application.dataPath, "Plugins", "valve.ini"),
+                Path.Combine(Application.dataPath, "Plugins", "steam.ini"),
+                Path.Combine(Application.dataPath, "Plugins", "huhuvr.ini"),
+                Path.GetFullPath(Path.Combine(Application.dataPath, "..", "SmartSteamEmu.ini")),
+            };
+
+            // Check for the existence of each file
+            foreach (string path in paths)
+            {
+                // If one is found, probably pirated
+                if (File.Exists(path))
+                    return true;
+            }
+
+            return false;
+        }
+    }
+}
\ No newline at end of file