diff --git a/FEXCore/Source/Interface/Core/BlockSamplingData.cpp b/FEXCore/Source/Interface/Core/BlockSamplingData.cpp
index dac9ed642..c4c6cb098 100644
--- a/FEXCore/Source/Interface/Core/BlockSamplingData.cpp
+++ b/FEXCore/Source/Interface/Core/BlockSamplingData.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "Interface/Core/BlockSamplingData.h"
 #include <FEXCore/Utils/LogManager.h>
 #include <cstring>
diff --git a/FEXCore/Source/Interface/Core/BlockSamplingData.h b/FEXCore/Source/Interface/Core/BlockSamplingData.h
index ec3b14293..e1d29dec5 100644
--- a/FEXCore/Source/Interface/Core/BlockSamplingData.h
+++ b/FEXCore/Source/Interface/Core/BlockSamplingData.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <cstdint>
diff --git a/FEXCore/Source/Interface/Core/CPUBackend.cpp b/FEXCore/Source/Interface/Core/CPUBackend.cpp
index 07cfa2285..5f7416430 100644
--- a/FEXCore/Source/Interface/Core/CPUBackend.cpp
+++ b/FEXCore/Source/Interface/Core/CPUBackend.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "FEXCore/IR/IR.h"
 #include "FEXCore/Utils/AllocatorHooks.h"
 #include "Interface/Context/Context.h"
diff --git a/FEXCore/Source/Interface/Core/CPUID.cpp b/FEXCore/Source/Interface/Core/CPUID.cpp
index 85aa941e0..5fb817f97 100644
--- a/FEXCore/Source/Interface/Core/CPUID.cpp
+++ b/FEXCore/Source/Interface/Core/CPUID.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 tags: opcodes|cpuid
diff --git a/FEXCore/Source/Interface/Core/CPUID.h b/FEXCore/Source/Interface/Core/CPUID.h
index 8dfa777a8..0eedf103c 100644
--- a/FEXCore/Source/Interface/Core/CPUID.h
+++ b/FEXCore/Source/Interface/Core/CPUID.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <FEXCore/Core/CPUID.h>
diff --git a/FEXCore/Source/Interface/Core/Core.cpp b/FEXCore/Source/Interface/Core/Core.cpp
index 9558218d2..27dfa4f43 100644
--- a/FEXCore/Source/Interface/Core/Core.cpp
+++ b/FEXCore/Source/Interface/Core/Core.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 category: glue ~ Logic that binds various parts together
diff --git a/FEXCore/Source/Interface/Core/DebugData.h b/FEXCore/Source/Interface/Core/DebugData.h
index d5f80cd80..ca02e773e 100644
--- a/FEXCore/Source/Interface/Core/DebugData.h
+++ b/FEXCore/Source/Interface/Core/DebugData.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 #include <stdint.h>
 
diff --git a/FEXCore/Source/Interface/Core/Frontend.cpp b/FEXCore/Source/Interface/Core/Frontend.cpp
index 79cf7816b..7c6d97664 100644
--- a/FEXCore/Source/Interface/Core/Frontend.cpp
+++ b/FEXCore/Source/Interface/Core/Frontend.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 tags: frontend|x86-meta-blocks
diff --git a/FEXCore/Source/Interface/Core/Frontend.h b/FEXCore/Source/Interface/Core/Frontend.h
index c6b7529d8..6050be162 100644
--- a/FEXCore/Source/Interface/Core/Frontend.h
+++ b/FEXCore/Source/Interface/Core/Frontend.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include "Interface/Core/X86Tables/X86Tables.h"
diff --git a/FEXCore/Source/Interface/Core/GdbServer.cpp b/FEXCore/Source/Interface/Core/GdbServer.cpp
index 8ab80f7cb..ec16e2804 100644
--- a/FEXCore/Source/Interface/Core/GdbServer.cpp
+++ b/FEXCore/Source/Interface/Core/GdbServer.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 tags: glue|gdbserver
diff --git a/FEXCore/Source/Interface/Core/GdbServer.h b/FEXCore/Source/Interface/Core/GdbServer.h
index d96697efa..e37f5cb94 100644
--- a/FEXCore/Source/Interface/Core/GdbServer.h
+++ b/FEXCore/Source/Interface/Core/GdbServer.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 tags: glue|gdbserver
diff --git a/FEXCore/Source/Interface/Core/HostFeatures.cpp b/FEXCore/Source/Interface/Core/HostFeatures.cpp
index 6e455b150..51c2b1bb8 100644
--- a/FEXCore/Source/Interface/Core/HostFeatures.cpp
+++ b/FEXCore/Source/Interface/Core/HostFeatures.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "Interface/Core/CPUID.h"
 #include <FEXCore/Core/HostFeatures.h>
 
diff --git a/FEXCore/Source/Interface/Core/InternalThreadState.h b/FEXCore/Source/Interface/Core/InternalThreadState.h
index d77d97e6c..016a9006d 100644
--- a/FEXCore/Source/Interface/Core/InternalThreadState.h
+++ b/FEXCore/Source/Interface/Core/InternalThreadState.h
@@ -1 +1,2 @@
+// SPDX-License-Identifier: MIT
 #include <FEXCore/Debug/InternalThreadState.h>
diff --git a/FEXCore/Source/Interface/Core/LookupCache.cpp b/FEXCore/Source/Interface/Core/LookupCache.cpp
index e4a970eda..03c3123c9 100644
--- a/FEXCore/Source/Interface/Core/LookupCache.cpp
+++ b/FEXCore/Source/Interface/Core/LookupCache.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 tags: glue|block-database
diff --git a/FEXCore/Source/Interface/Core/LookupCache.h b/FEXCore/Source/Interface/Core/LookupCache.h
index 8bbe99141..0f0e51bac 100644
--- a/FEXCore/Source/Interface/Core/LookupCache.h
+++ b/FEXCore/Source/Interface/Core/LookupCache.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 #include "Interface/Context/Context.h"
 #include <FEXCore/Utils/LogManager.h>
diff --git a/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp b/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
index a85621b89..965c3e329 100644
--- a/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+++ b/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 tags: frontend|x86-to-ir, opcodes|dispatcher-implementations
diff --git a/FEXCore/Source/Interface/Core/OpcodeDispatcher.h b/FEXCore/Source/Interface/Core/OpcodeDispatcher.h
index ccb77ad25..11fa55cf0 100644
--- a/FEXCore/Source/Interface/Core/OpcodeDispatcher.h
+++ b/FEXCore/Source/Interface/Core/OpcodeDispatcher.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include "Interface/Core/Frontend.h"
diff --git a/FEXCore/Source/Interface/Core/SignalDelegator.cpp b/FEXCore/Source/Interface/Core/SignalDelegator.cpp
index b67406fc8..32102b6eb 100644
--- a/FEXCore/Source/Interface/Core/SignalDelegator.cpp
+++ b/FEXCore/Source/Interface/Core/SignalDelegator.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include <FEXCore/Core/SignalDelegator.h>
 #include <FEXCore/Utils/LogManager.h>
 #include <FEXHeaderUtils/Syscalls.h>
diff --git a/FEXCore/Source/Interface/Core/X86DebugInfo.cpp b/FEXCore/Source/Interface/Core/X86DebugInfo.cpp
index 596a685bb..7d476c163 100644
--- a/FEXCore/Source/Interface/Core/X86DebugInfo.cpp
+++ b/FEXCore/Source/Interface/Core/X86DebugInfo.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #ifndef NDEBUG
 
 #include "Interface/Core/X86Tables/X86Tables.h"
diff --git a/FEXCore/Source/Interface/Core/X86HelperGen.cpp b/FEXCore/Source/Interface/Core/X86HelperGen.cpp
index 1cd5f2150..f59982e77 100644
--- a/FEXCore/Source/Interface/Core/X86HelperGen.cpp
+++ b/FEXCore/Source/Interface/Core/X86HelperGen.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 tags: glue|x86-guest-code
diff --git a/FEXCore/Source/Interface/Core/X86HelperGen.h b/FEXCore/Source/Interface/Core/X86HelperGen.h
index 5dd02a890..9871c5a91 100644
--- a/FEXCore/Source/Interface/Core/X86HelperGen.h
+++ b/FEXCore/Source/Interface/Core/X86HelperGen.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 tags: glue|x86-guest-code
diff --git a/FEXCore/Source/Interface/Core/X86Tables.cpp b/FEXCore/Source/Interface/Core/X86Tables.cpp
index ef277c808..3dd255f31 100644
--- a/FEXCore/Source/Interface/Core/X86Tables.cpp
+++ b/FEXCore/Source/Interface/Core/X86Tables.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 meta: frontend|x86-tables ~ Metadata that drives the frontend x86/64 decoding