diff --git a/packages/ckeditor5-package-generator/lib/templates/js-legacy/sample/ckeditor.js.txt b/packages/ckeditor5-package-generator/lib/templates/js-legacy/sample/ckeditor.js.txt
index c2dcfba7..e8c96966 100644
--- a/packages/ckeditor5-package-generator/lib/templates/js-legacy/sample/ckeditor.js.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/js-legacy/sample/ckeditor.js.txt
@@ -23,6 +23,7 @@ import <%= formattedNames.plugin.pascalCase %> from '../src/<%= formattedNames.p
 
 ClassicEditor
 	.create( document.querySelector( '#editor' ), {
+		licenseKey: 'GPL',
 		plugins: [
 			<%= formattedNames.plugin.pascalCase %>,
 			Essentials,
diff --git a/packages/ckeditor5-package-generator/lib/templates/js-legacy/sample/dll.html.txt b/packages/ckeditor5-package-generator/lib/templates/js-legacy/sample/dll.html.txt
index 506184f1..e2393ff1 100644
--- a/packages/ckeditor5-package-generator/lib/templates/js-legacy/sample/dll.html.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/js-legacy/sample/dll.html.txt
@@ -85,6 +85,7 @@
 
 	CKEditor5.editorClassic.ClassicEditor
 		.create( document.querySelector( '#editor' ), {
+			licenseKey: 'GPL',
 			plugins: [
 				CKEditor5[ '<%= formattedNames.package.camelCase %>' ].<%= formattedNames.plugin.pascalCase %>,
 				CKEditor5.essentials.Essentials,
diff --git a/packages/ckeditor5-package-generator/lib/templates/js-legacy/tests/_PLACEHOLDER_.js.txt b/packages/ckeditor5-package-generator/lib/templates/js-legacy/tests/_PLACEHOLDER_.js.txt
index 967d8b52..582b9763 100644
--- a/packages/ckeditor5-package-generator/lib/templates/js-legacy/tests/_PLACEHOLDER_.js.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/js-legacy/tests/_PLACEHOLDER_.js.txt
@@ -20,6 +20,7 @@ describe( '<%= formattedNames.plugin.pascalCase %>', () => {
 			document.body.appendChild( domElement );
 
 			editor = await ClassicEditor.create( domElement, {
+				licenseKey: 'GPL',
 				plugins: [
 					Paragraph,
 					Heading,
diff --git a/packages/ckeditor5-package-generator/lib/templates/js/sample/ckeditor.js.txt b/packages/ckeditor5-package-generator/lib/templates/js/sample/ckeditor.js.txt
index ca0bdac3..d5adb298 100644
--- a/packages/ckeditor5-package-generator/lib/templates/js/sample/ckeditor.js.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/js/sample/ckeditor.js.txt
@@ -33,6 +33,7 @@ import 'ckeditor5/ckeditor5.css';
 
 ClassicEditor
 	.create( document.querySelector( '#editor' ), {
+		licenseKey: 'GPL',
 		plugins: [
 			<%= formattedNames.plugin.pascalCase %>,
 			Essentials,
diff --git a/packages/ckeditor5-package-generator/lib/templates/js/tests/_PLACEHOLDER_.js.txt b/packages/ckeditor5-package-generator/lib/templates/js/tests/_PLACEHOLDER_.js.txt
index 81f893ce..ad028b57 100644
--- a/packages/ckeditor5-package-generator/lib/templates/js/tests/_PLACEHOLDER_.js.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/js/tests/_PLACEHOLDER_.js.txt
@@ -17,6 +17,7 @@ describe( '<%= formattedNames.plugin.pascalCase %>', () => {
 			document.body.appendChild( domElement );
 
 			editor = await ClassicEditor.create( domElement, {
+				licenseKey: 'GPL',
 				plugins: [
 					Paragraph,
 					Heading,
diff --git a/packages/ckeditor5-package-generator/lib/templates/ts-legacy/sample/ckeditor.ts.txt b/packages/ckeditor5-package-generator/lib/templates/ts-legacy/sample/ckeditor.ts.txt
index a5a77e8d..8038ed39 100644
--- a/packages/ckeditor5-package-generator/lib/templates/ts-legacy/sample/ckeditor.ts.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/ts-legacy/sample/ckeditor.ts.txt
@@ -27,6 +27,7 @@ import <%= formattedNames.plugin.pascalCase %> from '../src/<%= formattedNames.p
 
 ClassicEditor
 	.create( document.getElementById( 'editor' )!, {
+		licenseKey: 'GPL',
 		plugins: [
 			<%= formattedNames.plugin.pascalCase %>,
 			Essentials,
diff --git a/packages/ckeditor5-package-generator/lib/templates/ts-legacy/sample/dll.html.txt b/packages/ckeditor5-package-generator/lib/templates/ts-legacy/sample/dll.html.txt
index 6c39e245..42ce5419 100644
--- a/packages/ckeditor5-package-generator/lib/templates/ts-legacy/sample/dll.html.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/ts-legacy/sample/dll.html.txt
@@ -96,6 +96,7 @@
 
 	CKEditor5.editorClassic.ClassicEditor
 		.create( document.querySelector( '#editor' ), {
+			licenseKey: 'GPL',
 			plugins: [
 				CKEditor5[ '<%= formattedNames.package.camelCase %>' ].<%= formattedNames.plugin.pascalCase %>,
 				CKEditor5.essentials.Essentials,
diff --git a/packages/ckeditor5-package-generator/lib/templates/ts-legacy/tests/_PLACEHOLDER_.ts.txt b/packages/ckeditor5-package-generator/lib/templates/ts-legacy/tests/_PLACEHOLDER_.ts.txt
index 17781905..770128f1 100644
--- a/packages/ckeditor5-package-generator/lib/templates/ts-legacy/tests/_PLACEHOLDER_.ts.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/ts-legacy/tests/_PLACEHOLDER_.ts.txt
@@ -18,6 +18,7 @@ describe( '<%= formattedNames.plugin.pascalCase %>', () => {
 			document.body.appendChild( domElement );
 
 			editor = await ClassicEditor.create( domElement, {
+				licenseKey: 'GPL',
 				plugins: [
 					Paragraph,
 					Heading,
diff --git a/packages/ckeditor5-package-generator/lib/templates/ts/sample/ckeditor.ts.txt b/packages/ckeditor5-package-generator/lib/templates/ts/sample/ckeditor.ts.txt
index b149dde4..78fd646e 100644
--- a/packages/ckeditor5-package-generator/lib/templates/ts/sample/ckeditor.ts.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/ts/sample/ckeditor.ts.txt
@@ -37,6 +37,7 @@ import 'ckeditor5/ckeditor5.css';
 
 ClassicEditor
 	.create( document.getElementById( 'editor' )!, {
+		licenseKey: 'GPL',
 		plugins: [
 			<%= formattedNames.plugin.pascalCase %>,
 			Essentials,
diff --git a/packages/ckeditor5-package-generator/lib/templates/ts/tests/_PLACEHOLDER_.ts.txt b/packages/ckeditor5-package-generator/lib/templates/ts/tests/_PLACEHOLDER_.ts.txt
index 86f9186a..b7a1ba3d 100644
--- a/packages/ckeditor5-package-generator/lib/templates/ts/tests/_PLACEHOLDER_.ts.txt
+++ b/packages/ckeditor5-package-generator/lib/templates/ts/tests/_PLACEHOLDER_.ts.txt
@@ -15,6 +15,7 @@ describe( '<%= formattedNames.plugin.pascalCase %>', () => {
 			document.body.appendChild( domElement );
 
 			editor = await ClassicEditor.create( domElement, {
+				licenseKey: 'GPL',
 				plugins: [
 					Paragraph,
 					Heading,