diff --git a/lh-poster/README.md b/lh-poster/README.md
index 6cabb2b..cc3fa34 100644
--- a/lh-poster/README.md
+++ b/lh-poster/README.md
@@ -19,4 +19,4 @@ can either use the class file (i.e., `\documentclass{lh-poster}` or use
 
 ## License
 This project is dual-licensed under a 2-clause BSD-style license and/or 
-the LPPL version 1 or any later version. 
+the LPPL version 1.3c or (at your opinion) any later version. 
diff --git a/lh-poster/beamercolorthemelh-poster.sty b/lh-poster/beamercolorthemelh-poster.sty
index efa4c88..2192605 100644
--- a/lh-poster/beamercolorthemelh-poster.sty
+++ b/lh-poster/beamercolorthemelh-poster.sty
@@ -4,10 +4,11 @@
 %%   This program can be redistributed and/or modified under the terms
 %%   of the LaTeX Project Public License Distributed from CTAN
 %%   archives in directory macros/latex/base/lppl.txt; either
-%%   version 1 of the License, or any later version.
+%%   version 1.3c of the License, or (at your opinion) any later version.
 %%   OR
 %%   The 2-clause BSD-style license.
 %%
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}[1994/06/01]
 \ProvidesPackage{beamercolorthemelh-poster}
   [2017/04/14 v0.0  LaTeX poster class implementing the cooperate design of LogicalHacking.com]
diff --git a/lh-poster/beamerfontthemelh-poster.sty b/lh-poster/beamerfontthemelh-poster.sty
index 7823867..a4edcd1 100644
--- a/lh-poster/beamerfontthemelh-poster.sty
+++ b/lh-poster/beamerfontthemelh-poster.sty
@@ -4,15 +4,11 @@
 %%   This program can be redistributed and/or modified under the terms
 %%   of the LaTeX Project Public License Distributed from CTAN
 %%   archives in directory macros/latex/base/lppl.txt; either
-%%   version 1 of the License, or any later version.
+%%   version 1.3c of the License, or (at your opinion) any later version.
 %%   OR
 %%   The 2-clause BSD-style license.
 %%
-
-% Headline: TUOS Logo left, title information
-% Footer: References, Ackowledgeemnts, Partner Logos
-
-
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \ProvidesPackage{beamerfontthemelh-poster}
   [2017/04/14 v0.0  LaTeX poster class implementing the cooperate design of LogicalHacking.com]
 \setbeamerfont{title}{size=\Huge}
diff --git a/lh-poster/beamerinnerthemelh-poster.sty b/lh-poster/beamerinnerthemelh-poster.sty
index 269a8a5..9f0564e 100644
--- a/lh-poster/beamerinnerthemelh-poster.sty
+++ b/lh-poster/beamerinnerthemelh-poster.sty
@@ -4,10 +4,11 @@
 %%   This program can be redistributed and/or modified under the terms
 %%   of the LaTeX Project Public License Distributed from CTAN
 %%   archives in directory macros/latex/base/lppl.txt; either
-%%   version 1 of the License, or any later version.
+%%   version 1.3c of the License, or (at your opinion) any later version.
 %%   OR
 %%   The 2-clause BSD-style license.
 %%
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}[1994/06/01]
 \ProvidesPackage{beamerinnerthemelh-poster}
    [2017/04/14 v0.0  LaTeX poster class implementing the cooperate design of LogicalHacking.com]
diff --git a/lh-poster/beamerthemelh-poster.sty b/lh-poster/beamerthemelh-poster.sty
index 0913f55..e092cfc 100644
--- a/lh-poster/beamerthemelh-poster.sty
+++ b/lh-poster/beamerthemelh-poster.sty
@@ -4,11 +4,11 @@
 %%   This program can be redistributed and/or modified under the terms
 %%   of the LaTeX Project Public License Distributed from CTAN
 %%   archives in directory macros/latex/base/lppl.txt; either
-%%   version 1 of the License, or any later version.
+%%   version 1.3c of the License, or (at your opinion) any later version.
 %%   OR
 %%   The 2-clause BSD-style license.
 %%
-
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \ProvidesPackage{beamerthemelh-poster}
    [2017/04/14 v0.0  LaTeX poster class implementing the cooperate design of LogicalHacking.com]
 
diff --git a/lh-poster/lh-poster.cls b/lh-poster/lh-poster.cls
index 8ccba8c..f5f5550 100644
--- a/lh-poster/lh-poster.cls
+++ b/lh-poster/lh-poster.cls
@@ -4,10 +4,11 @@
 %%   This program can be redistributed and/or modified under the terms
 %%   of the LaTeX Project Public License Distributed from CTAN
 %%   archives in directory macros/latex/base/lppl.txt; either
-%%   version 1 of the License, or any later version.
+%%   version 1.3c of the License, or (at your opinion) any later version.
 %%   OR
 %%   The 2-clause BSD-style license.
 %%
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}[1994/06/01]
 \ProvidesClass{lh-poster}%
   [2017/04/14 v0.0  LaTeX poster class implementing the cooperate design of LogicalHacking.com]