diff --git a/src/Microsoft.AspNetCore.SignalR.Common/IInvocationBinder.cs b/src/Microsoft.AspNetCore.SignalR.Common/IInvocationBinder.cs
index 755a2b4434..7b56fc36eb 100644
--- a/src/Microsoft.AspNetCore.SignalR.Common/IInvocationBinder.cs
+++ b/src/Microsoft.AspNetCore.SignalR.Common/IInvocationBinder.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 
 namespace Microsoft.AspNetCore.SignalR
 {
diff --git a/src/Microsoft.AspNetCore.SignalR.Common/InvocationMessage.cs b/src/Microsoft.AspNetCore.SignalR.Common/InvocationMessage.cs
index 27fbe9ad26..fc0c1bb5ca 100644
--- a/src/Microsoft.AspNetCore.SignalR.Common/InvocationMessage.cs
+++ b/src/Microsoft.AspNetCore.SignalR.Common/InvocationMessage.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
diff --git a/src/Microsoft.AspNetCore.Sockets.Client/ITransport.cs b/src/Microsoft.AspNetCore.Sockets.Client/ITransport.cs
index 498c036fca..1424714e47 100644
--- a/src/Microsoft.AspNetCore.Sockets.Client/ITransport.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Client/ITransport.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 using System.IO.Pipelines;
 using System.Threading.Tasks;
 
diff --git a/src/Microsoft.AspNetCore.Sockets.Client/LongPollingTransport.cs b/src/Microsoft.AspNetCore.Sockets.Client/LongPollingTransport.cs
index aca67c9cd6..0ba6ca6499 100644
--- a/src/Microsoft.AspNetCore.Sockets.Client/LongPollingTransport.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Client/LongPollingTransport.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 using System.IO.Pipelines;
 using System.Net;
 using System.Net.Http;
diff --git a/src/Microsoft.AspNetCore.Sockets.Client/NullLoggerFactory.cs b/src/Microsoft.AspNetCore.Sockets.Client/NullLoggerFactory.cs
index 3259cf6aa7..df6e3d9cc0 100644
--- a/src/Microsoft.AspNetCore.Sockets.Client/NullLoggerFactory.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Client/NullLoggerFactory.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;
 
diff --git a/src/Microsoft.AspNetCore.Sockets.Client/PipelineConnection.cs b/src/Microsoft.AspNetCore.Sockets.Client/PipelineConnection.cs
index adf279e500..f0f2a05b5f 100644
--- a/src/Microsoft.AspNetCore.Sockets.Client/PipelineConnection.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Client/PipelineConnection.cs
@@ -1,4 +1,7 @@
-using System.IO.Pipelines;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Sockets.Client
 {
diff --git a/src/Microsoft.AspNetCore.Sockets.Client/PipelineFactoryExtensions.cs b/src/Microsoft.AspNetCore.Sockets.Client/PipelineFactoryExtensions.cs
index cd8da543c6..946db002b5 100644
--- a/src/Microsoft.AspNetCore.Sockets.Client/PipelineFactoryExtensions.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Client/PipelineFactoryExtensions.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 using System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Sockets.Client
diff --git a/src/Microsoft.AspNetCore.Sockets.Client/Utils.cs b/src/Microsoft.AspNetCore.Sockets.Client/Utils.cs
index 034918bd18..db17b2a0ed 100644
--- a/src/Microsoft.AspNetCore.Sockets.Client/Utils.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Client/Utils.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 
 namespace Microsoft.AspNetCore.Sockets.Client
 {
diff --git a/src/Microsoft.AspNetCore.Sockets/SocketsApplicationLifetimeService.cs b/src/Microsoft.AspNetCore.Sockets/SocketsApplicationLifetimeService.cs
index 619dbf9492..afb44b1543 100644
--- a/src/Microsoft.AspNetCore.Sockets/SocketsApplicationLifetimeService.cs
+++ b/src/Microsoft.AspNetCore.Sockets/SocketsApplicationLifetimeService.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
diff --git a/src/Microsoft.AspNetCore.Sockets/SocketsDependencyInjectionExtensions.cs b/src/Microsoft.AspNetCore.Sockets/SocketsDependencyInjectionExtensions.cs
index b87a6d28c2..be5d93aec1 100644
--- a/src/Microsoft.AspNetCore.Sockets/SocketsDependencyInjectionExtensions.cs
+++ b/src/Microsoft.AspNetCore.Sockets/SocketsDependencyInjectionExtensions.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 using System.Collections.Generic;
 using System.IO.Pipelines;
 using System.Linq;
diff --git a/test/Microsoft.AspNetCore.SignalR.Client.FunctionalTests/Properties/AssemblyInfo.cs b/test/Microsoft.AspNetCore.SignalR.Client.FunctionalTests/Properties/AssemblyInfo.cs
index 9c5704d6eb..2c11dbe170 100644
--- a/test/Microsoft.AspNetCore.SignalR.Client.FunctionalTests/Properties/AssemblyInfo.cs
+++ b/test/Microsoft.AspNetCore.SignalR.Client.FunctionalTests/Properties/AssemblyInfo.cs
@@ -1,4 +1,7 @@
-using System.Reflection;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
diff --git a/test/Microsoft.AspNetCore.SignalR.Tests/Properties/AssemblyInfo.cs b/test/Microsoft.AspNetCore.SignalR.Tests/Properties/AssemblyInfo.cs
index a41208291b..55ddeb7354 100644
--- a/test/Microsoft.AspNetCore.SignalR.Tests/Properties/AssemblyInfo.cs
+++ b/test/Microsoft.AspNetCore.SignalR.Tests/Properties/AssemblyInfo.cs
@@ -1,4 +1,7 @@
-using System.Reflection;
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;