diff --git a/test/OpenIddict.Core.Tests/OpenIddictBuilderTests.cs b/test/OpenIddict.Core.Tests/OpenIddictBuilderTests.cs
index fd9fd1cb..6ef5830b 100644
--- a/test/OpenIddict.Core.Tests/OpenIddictBuilderTests.cs
+++ b/test/OpenIddict.Core.Tests/OpenIddictBuilderTests.cs
@@ -1,4 +1,10 @@
-using System;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Moq;
diff --git a/test/OpenIddict.Core.Tests/OpenIddictExtensionsTests.cs b/test/OpenIddict.Core.Tests/OpenIddictExtensionsTests.cs
index b740f2ff..edb2ccfa 100644
--- a/test/OpenIddict.Core.Tests/OpenIddictExtensionsTests.cs
+++ b/test/OpenIddict.Core.Tests/OpenIddictExtensionsTests.cs
@@ -1,4 +1,10 @@
-using System;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System;
 using Microsoft.Extensions.DependencyInjection;
 using OpenIddict.Models;
 using Xunit;
diff --git a/test/OpenIddict.EntityFramework.Tests/OpenIddictExtensionsTests.cs b/test/OpenIddict.EntityFramework.Tests/OpenIddictExtensionsTests.cs
index 69a92f74..45d9007c 100644
--- a/test/OpenIddict.EntityFramework.Tests/OpenIddictExtensionsTests.cs
+++ b/test/OpenIddict.EntityFramework.Tests/OpenIddictExtensionsTests.cs
@@ -1,3 +1,9 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
 using System;
 using System.Data.Entity;
 using Microsoft.Extensions.DependencyInjection;
diff --git a/test/OpenIddict.EntityFrameworkCore.Tests/OpenIddictExtensionsTests.cs b/test/OpenIddict.EntityFrameworkCore.Tests/OpenIddictExtensionsTests.cs
index 7a59825f..00b9f939 100644
--- a/test/OpenIddict.EntityFrameworkCore.Tests/OpenIddictExtensionsTests.cs
+++ b/test/OpenIddict.EntityFrameworkCore.Tests/OpenIddictExtensionsTests.cs
@@ -1,4 +1,10 @@
-using System;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using OpenIddict.Models;
diff --git a/test/OpenIddict.Mvc.Tests/OpenIddictExtensionsTests.cs b/test/OpenIddict.Mvc.Tests/OpenIddictExtensionsTests.cs
index 618711c2..e6674752 100644
--- a/test/OpenIddict.Mvc.Tests/OpenIddictExtensionsTests.cs
+++ b/test/OpenIddict.Mvc.Tests/OpenIddictExtensionsTests.cs
@@ -1,4 +1,10 @@
-using Microsoft.AspNetCore.Mvc;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
 using Xunit;
diff --git a/test/OpenIddict.Mvc.Tests/OpenIddictModelBinderTests.cs b/test/OpenIddict.Mvc.Tests/OpenIddictModelBinderTests.cs
index 77964abc..42f4182d 100644
--- a/test/OpenIddict.Mvc.Tests/OpenIddictModelBinderTests.cs
+++ b/test/OpenIddict.Mvc.Tests/OpenIddictModelBinderTests.cs
@@ -1,4 +1,10 @@
-using System;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Primitives;
diff --git a/test/OpenIddict.Tests/OpenIddictExtensionsTests.cs b/test/OpenIddict.Tests/OpenIddictExtensionsTests.cs
index d04ad101..77c3e11c 100644
--- a/test/OpenIddict.Tests/OpenIddictExtensionsTests.cs
+++ b/test/OpenIddict.Tests/OpenIddictExtensionsTests.cs
@@ -1,4 +1,10 @@
-using System;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System;
 using System.IdentityModel.Tokens.Jwt;
 using System.Reflection;
 using AspNet.Security.OpenIdConnect.Primitives;
diff --git a/test/OpenIddict.Tests/OpenIddictInitializerTests.cs b/test/OpenIddict.Tests/OpenIddictInitializerTests.cs
index 19782a02..e86dd3f1 100644
--- a/test/OpenIddict.Tests/OpenIddictInitializerTests.cs
+++ b/test/OpenIddict.Tests/OpenIddictInitializerTests.cs
@@ -1,4 +1,10 @@
-using System;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System;
 using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Client;
 using AspNet.Security.OpenIdConnect.Primitives;
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Authentication.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Authentication.cs
index d84d9972..5657820c 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Authentication.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Authentication.cs
@@ -1,4 +1,10 @@
-using System.IO;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Client;
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Discovery.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Discovery.cs
index 1b3e3d81..4eb047b5 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Discovery.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Discovery.cs
@@ -1,4 +1,10 @@
-using System.Threading.Tasks;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Client;
 using AspNet.Security.OpenIdConnect.Primitives;
 using Microsoft.AspNetCore.Authentication.Cookies;
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Exchange.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Exchange.cs
index 709f54e0..be2ca0ec 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Exchange.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Exchange.cs
@@ -1,4 +1,10 @@
-using System.Security.Claims;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System.Security.Claims;
 using System.Threading;
 using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Client;
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Introspection.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Introspection.cs
index ab4275f3..192eba21 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Introspection.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Introspection.cs
@@ -1,4 +1,10 @@
-using System.Security.Claims;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System.Security.Claims;
 using System.Threading;
 using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Client;
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Revocation.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Revocation.cs
index f062cff0..e5bbec28 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Revocation.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Revocation.cs
@@ -1,4 +1,10 @@
-using System;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System;
 using System.IdentityModel.Tokens.Jwt;
 using System.Security.Claims;
 using System.Threading;
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Serialization.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Serialization.cs
index fe10bb4f..7396e477 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Serialization.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Serialization.cs
@@ -1,4 +1,10 @@
-using System;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System;
 using System.Threading;
 using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Client;
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Session.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Session.cs
index d610c289..da087aa0 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Session.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Session.cs
@@ -1,4 +1,10 @@
-using System.Threading;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System.Threading;
 using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Client;
 using AspNet.Security.OpenIdConnect.Primitives;
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Userinfo.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Userinfo.cs
index be80b2a3..883f383d 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Userinfo.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Userinfo.cs
@@ -1,4 +1,10 @@
-using System.Threading.Tasks;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Client;
 using AspNet.Security.OpenIdConnect.Primitives;
 using Xunit;
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.cs
index 301554d8..136fe8fd 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.cs
@@ -1,4 +1,10 @@
-using System;
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/openiddict/openiddict-core for more information concerning
+ * the license and the contributors participating to this project.
+ */
+
+using System;
 using System.Reflection;
 using System.Security.Claims;
 using System.Threading.Tasks;