diff --git a/README.md b/README.md
index 0388491..6b2098c 100644
--- a/README.md
+++ b/README.md
@@ -4,5 +4,5 @@ conference in Belfast.
 
 ## License
 If not otherwise stated, all sub-projects are dual-licensed under a
-2-clause BSD-style license and/or the LPPL version 1 or any later 
-version. 
+2-clause BSD-style license and/or the LPPL version 1.3c or (at your 
+opinion) any later version. 
diff --git a/appseceu2017.cls b/appseceu2017.cls
index 49f65ed..1fd4076 100644
--- a/appseceu2017.cls
+++ b/appseceu2017.cls
@@ -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-1.0+ OR BSD-2-Clause
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}[1994/06/01]
 \ProvidesClass{appseceu2017}%
   [2017/04/28 v0.0  LaTeX presenation class mimicking the design of the OWASP AppSecEU 2017 PowerPoint template.]
diff --git a/beamercolorthemeappseceu2017.sty b/beamercolorthemeappseceu2017.sty
index 7349488..ea59458 100644
--- a/beamercolorthemeappseceu2017.sty
+++ b/beamercolorthemeappseceu2017.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-1.0+ OR BSD-2-Clause
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}[1994/06/01]
 \ProvidesPackage{beamercolorthemeappseceu2017}
      [2017/04/28 v0.0  LaTeX presentation class mimicking the design of the OWASP AppSecEU 2017 PowerPoint template.]
diff --git a/beamerfontthemeappseceu2017.sty b/beamerfontthemeappseceu2017.sty
index 593b8e2..28565ce 100644
--- a/beamerfontthemeappseceu2017.sty
+++ b/beamerfontthemeappseceu2017.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-1.0+ OR BSD-2-Clause
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}[1994/06/01]
 \ProvidesPackage{beamerfontthemeappseceu2017}
      [2017/04/28 v0.0  LaTeX presentation class mimicking the design of the OWASP AppSecEU 2017 PowerPoint template.]
diff --git a/beamerinnerthemeappseceu2017.sty b/beamerinnerthemeappseceu2017.sty
index b0dce9b..88748b3 100644
--- a/beamerinnerthemeappseceu2017.sty
+++ b/beamerinnerthemeappseceu2017.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-1.0+ OR BSD-2-Clause
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}[1994/06/01]
 
 \ProvidesPackage{beamerinnerthemeappseceu2017}
diff --git a/beamerouterthemeappseceu2017.sty b/beamerouterthemeappseceu2017.sty
index 8535d73..9da7a96 100644
--- a/beamerouterthemeappseceu2017.sty
+++ b/beamerouterthemeappseceu2017.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-1.0+ OR BSD-2-Clause
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}[1994/06/01]
 \ProvidesPackage{beamerouterthemeappseceu2017}
      [2017/04/28 v0.0  LaTeX presentation class mimicking the design of the OWASP AppSecEU 2017 PowerPoint template.]
diff --git a/beamerthemeappseceu2017.sty b/beamerthemeappseceu2017.sty
index fd2c496..e3aa68c 100644
--- a/beamerthemeappseceu2017.sty
+++ b/beamerthemeappseceu2017.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-1.0+ OR BSD-2-Clause
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}[1994/06/01]
 \ProvidesPackage{beamerthemeappseceu2017}
      [2017/04/28 v0.0  LaTeX presentation class mimicking the design of the OWASP AppSecEU 2017 PowerPoint template.]