diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 9e32d15..438fe5d 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0
+# SPDX-License-Identifier: PMPL-1.0-or-later
 name: CodeQL Security Analysis
 
 on:
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
index 29853b2..7027732 100644
--- a/.github/workflows/scorecard.yml
+++ b/.github/workflows/scorecard.yml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0
+# SPDX-License-Identifier: PMPL-1.0-or-later
 name: OSSF Scorecard
 on:
   push:
diff --git a/.github/workflows/secret-scanner.yml b/.github/workflows/secret-scanner.yml
index 8801d53..cb9cdf8 100644
--- a/.github/workflows/secret-scanner.yml
+++ b/.github/workflows/secret-scanner.yml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0
+# SPDX-License-Identifier: PMPL-1.0-or-later
 # Prevention workflow - scans for hardcoded secrets before they reach main
 name: Secret Scanner
 
diff --git a/affinescript/.machine_readable/contractiles/dust/Dustfile b/affinescript/.machine_readable/contractiles/dust/Dustfile
index 6f93c6a..df42b13 100644
--- a/affinescript/.machine_readable/contractiles/dust/Dustfile
+++ b/affinescript/.machine_readable/contractiles/dust/Dustfile
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PLMP-1.0-or-later
+# SPDX-License-Identifier: PMPL-1.0-or-later
 # Dustfile template - recovery and rollback semantics
 
 version: 1
diff --git a/affinescript/.machine_readable/contractiles/must/Mustfile b/affinescript/.machine_readable/contractiles/must/Mustfile
index dc2c6b6..5a97a60 100644
--- a/affinescript/.machine_readable/contractiles/must/Mustfile
+++ b/affinescript/.machine_readable/contractiles/must/Mustfile
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PLMP-1.0-or-later
+# SPDX-License-Identifier: PMPL-1.0-or-later
 # Mustfile - declarative state contract (template)
 # See: https://github.com/hyperpolymath/mustfile
 
diff --git a/affinescript/.machine_readable/contractiles/trust/Trustfile.hs b/affinescript/.machine_readable/contractiles/trust/Trustfile.hs
index 60e68c2..03c6d0d 100644
--- a/affinescript/.machine_readable/contractiles/trust/Trustfile.hs
+++ b/affinescript/.machine_readable/contractiles/trust/Trustfile.hs
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PLMP-1.0-or-later
+-- SPDX-License-Identifier: PMPL-1.0-or-later
 -- Trustfile template - cryptographic and provenance verification
 
 module Trustfile where
diff --git a/affinescript/LICENSING-GUIDE.md b/affinescript/LICENSING-GUIDE.md
index 15543bd..814d78a 100644
--- a/affinescript/LICENSING-GUIDE.md
+++ b/affinescript/LICENSING-GUIDE.md
@@ -168,7 +168,7 @@ graph TD
 
 **File Header:**
 ```rust
-// SPDX-License-Identifier: PMPL-1.0
+// SPDX-License-Identifier: PMPL-1.0-or-later
 // SPDX-License-Identifier: MPL-2.0
 // SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell
 //
diff --git a/affinescript/ROADMAP.adoc b/affinescript/ROADMAP.adoc
index 5d35e8d..2cf3242 100644
--- a/affinescript/ROADMAP.adoc
+++ b/affinescript/ROADMAP.adoc
@@ -312,7 +312,7 @@ Priority areas for contributors:
 
 == License
 
-SPDX-License-Identifier: PMPL-1.0-or-later-or-later
+SPDX-License-Identifier: PMPL-1.0-or-later
 
 == See Also
 
diff --git a/affinescript/RSR_OUTLINE.adoc b/affinescript/RSR_OUTLINE.adoc
index 6e9f598..75296fd 100644
--- a/affinescript/RSR_OUTLINE.adoc
+++ b/affinescript/RSR_OUTLINE.adoc
@@ -209,7 +209,7 @@ This template is part of:
 
 == License
 
-SPDX-License-Identifier: PMPL-1.0-or-later-or-later
+SPDX-License-Identifier: PMPL-1.0-or-later
 
 == Links
 
diff --git a/affinescript/stdlib/effects.affine b/affinescript/stdlib/effects.affine
index 4408e05..69d9a03 100644
--- a/affinescript/stdlib/effects.affine
+++ b/affinescript/stdlib/effects.affine
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: PMPL-1.0
+// SPDX-License-Identifier: PMPL-1.0-or-later
 // AffineScript Standard Library - Effect Declarations
 
 // Core IO effect - file and console operations