diff --git a/EonaCat.Connections.Client/Program.cs b/EonaCat.Connections.Client/Program.cs
index 639c227..8a2a77f 100644
--- a/EonaCat.Connections.Client/Program.cs
+++ b/EonaCat.Connections.Client/Program.cs
@@ -1,4 +1,7 @@
-using EonaCat.Connections.Models;
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+using EonaCat.Connections.Models;
 using EonaCat.Connections.Processors;
 using System.Reflection;
 using System.Text;
diff --git a/EonaCat.Connections.Server/Program.cs b/EonaCat.Connections.Server/Program.cs
index 4d80b42..7788ced 100644
--- a/EonaCat.Connections.Server/Program.cs
+++ b/EonaCat.Connections.Server/Program.cs
@@ -1,4 +1,7 @@
-using EonaCat.Connections.Models;
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+using EonaCat.Connections.Models;
 using System.Reflection;
 
 namespace EonaCat.Connections.Server.Example
diff --git a/EonaCat.Connections/BufferSize.cs b/EonaCat.Connections/BufferSize.cs
index 0d57d8e..96a88dc 100644
--- a/EonaCat.Connections/BufferSize.cs
+++ b/EonaCat.Connections/BufferSize.cs
@@ -1,4 +1,7 @@
-using System;
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
diff --git a/EonaCat.Connections/DisconnectReason.cs b/EonaCat.Connections/DisconnectReason.cs
index e67f4e1..1e2fb82 100644
--- a/EonaCat.Connections/DisconnectReason.cs
+++ b/EonaCat.Connections/DisconnectReason.cs
@@ -1,4 +1,7 @@
-namespace EonaCat.Connections
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+namespace EonaCat.Connections
 {
     public enum DisconnectReason
     {
diff --git a/EonaCat.Connections/EventArguments/ConnectionEventArgs.cs b/EonaCat.Connections/EventArguments/ConnectionEventArgs.cs
index f6728f8..66b13b0 100644
--- a/EonaCat.Connections/EventArguments/ConnectionEventArgs.cs
+++ b/EonaCat.Connections/EventArguments/ConnectionEventArgs.cs
@@ -1,6 +1,9 @@
 using System.Net;
 using System.Net.Sockets;
 
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
 namespace EonaCat.Connections.EventArguments
 {
     public class ConnectionEventArgs : EventArgs
diff --git a/EonaCat.Connections/EventArguments/DataReceivedEventArgs.cs b/EonaCat.Connections/EventArguments/DataReceivedEventArgs.cs
index 473d465..7083ae2 100644
--- a/EonaCat.Connections/EventArguments/DataReceivedEventArgs.cs
+++ b/EonaCat.Connections/EventArguments/DataReceivedEventArgs.cs
@@ -1,5 +1,8 @@
 using System.Net;
 
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
 namespace EonaCat.Connections
 {
     public class DataReceivedEventArgs : EventArgs
diff --git a/EonaCat.Connections/EventArguments/ErrorEventArgs.cs b/EonaCat.Connections/EventArguments/ErrorEventArgs.cs
index 6207a4f..42b9c28 100644
--- a/EonaCat.Connections/EventArguments/ErrorEventArgs.cs
+++ b/EonaCat.Connections/EventArguments/ErrorEventArgs.cs
@@ -1,4 +1,7 @@
-namespace EonaCat.Connections.EventArguments
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+namespace EonaCat.Connections.EventArguments
 {
     public class ErrorEventArgs : EventArgs
     {
diff --git a/EonaCat.Connections/EventArguments/PingEventArgs.cs b/EonaCat.Connections/EventArguments/PingEventArgs.cs
index cbf2fbe..d38e79f 100644
--- a/EonaCat.Connections/EventArguments/PingEventArgs.cs
+++ b/EonaCat.Connections/EventArguments/PingEventArgs.cs
@@ -1,5 +1,8 @@
 using System.Net;
 
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
 namespace EonaCat.Connections.EventArguments
 {
     public class PingEventArgs : EventArgs
diff --git a/EonaCat.Connections/Helpers/AesKeyExchange.cs b/EonaCat.Connections/Helpers/AesKeyExchange.cs
index ba876bb..a6a13b0 100644
--- a/EonaCat.Connections/Helpers/AesKeyExchange.cs
+++ b/EonaCat.Connections/Helpers/AesKeyExchange.cs
@@ -1,6 +1,9 @@
 using System.Security.Cryptography;
 using System.Text;
 
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
 namespace EonaCat.Connections.Helpers
 {
     public static class AesKeyExchange
diff --git a/EonaCat.Connections/Helpers/StringHelper.cs b/EonaCat.Connections/Helpers/StringHelper.cs
index 6a5e9b8..6148d2a 100644
--- a/EonaCat.Connections/Helpers/StringHelper.cs
+++ b/EonaCat.Connections/Helpers/StringHelper.cs
@@ -1,5 +1,8 @@
 namespace EonaCat.Connections.Helpers
 {
+    // This file is part of the EonaCat project(s) which is released under the Apache License.
+    // See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
     internal static class StringHelper
     {
         public static string GetTextBetweenTags(this string value,
diff --git a/EonaCat.Connections/Helpers/TcpSeparators.cs b/EonaCat.Connections/Helpers/TcpSeparators.cs
index 0391256..9d324b0 100644
--- a/EonaCat.Connections/Helpers/TcpSeparators.cs
+++ b/EonaCat.Connections/Helpers/TcpSeparators.cs
@@ -1,5 +1,8 @@
 using System.Text;
 
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
 namespace EonaCat.Connections.Helpers
 {
     public static class TcpSeparators
diff --git a/EonaCat.Connections/Models/Configuration.cs b/EonaCat.Connections/Models/Configuration.cs
index 84ecf5a..a595b1c 100644
--- a/EonaCat.Connections/Models/Configuration.cs
+++ b/EonaCat.Connections/Models/Configuration.cs
@@ -2,12 +2,15 @@
 using System.Net.Security;
 using System.Security.Cryptography.X509Certificates;
 
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
 namespace EonaCat.Connections.Models
 {
     public class Configuration
     {
         public event EventHandler<string> OnLog;
-        public List<string> TrustedThumbprints = new List<string> { "31446234774e63fed4bc252cf466ac1bed050439", "4e34475f8618f4cbd65a9852b8bf45e740a52fff", "b0d0de15cfe045547aeb403d0e9df8095a88a32a" };
+        public List<string> TrustedThumbprints = new List<string>();
         public bool EnableAutoReconnect { get; set; } = true;
         public int ReconnectDelayInSeconds { get; set; } = 5;
         public int MaxReconnectAttempts { get; set; } = 0; // 0 means unlimited attempts
diff --git a/EonaCat.Connections/Models/Connection.cs b/EonaCat.Connections/Models/Connection.cs
index a29bdc3..b451997 100644
--- a/EonaCat.Connections/Models/Connection.cs
+++ b/EonaCat.Connections/Models/Connection.cs
@@ -2,6 +2,9 @@
 using System.Net.Sockets;
 using System.Security.Cryptography;
 
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
 namespace EonaCat.Connections.Models
 {
     public class Connection
diff --git a/EonaCat.Connections/Models/FramingMode.cs b/EonaCat.Connections/Models/FramingMode.cs
index e5eb285..e99c942 100644
--- a/EonaCat.Connections/Models/FramingMode.cs
+++ b/EonaCat.Connections/Models/FramingMode.cs
@@ -1,4 +1,7 @@
-namespace EonaCat.Connections.Models
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+namespace EonaCat.Connections.Models
 {
     public enum FramingMode
     {
diff --git a/EonaCat.Connections/Models/ProcessedMessage.cs b/EonaCat.Connections/Models/ProcessedMessage.cs
index 2e9a070..0dc2638 100644
--- a/EonaCat.Connections/Models/ProcessedMessage.cs
+++ b/EonaCat.Connections/Models/ProcessedMessage.cs
@@ -1,4 +1,7 @@
-namespace EonaCat.Connections.Models
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+namespace EonaCat.Connections.Models
 {
     public class ProcessedMessage<TData>
     {
diff --git a/EonaCat.Connections/Models/ProcessedTextMessage.cs b/EonaCat.Connections/Models/ProcessedTextMessage.cs
index 10fae02..af6252e 100644
--- a/EonaCat.Connections/Models/ProcessedTextMessage.cs
+++ b/EonaCat.Connections/Models/ProcessedTextMessage.cs
@@ -1,4 +1,7 @@
-namespace EonaCat.Connections.Models
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+namespace EonaCat.Connections.Models
 {
     public class ProcessedTextMessage
     {
diff --git a/EonaCat.Connections/Models/ProtocolType.cs b/EonaCat.Connections/Models/ProtocolType.cs
index f37947e..0c2464b 100644
--- a/EonaCat.Connections/Models/ProtocolType.cs
+++ b/EonaCat.Connections/Models/ProtocolType.cs
@@ -1,4 +1,7 @@
-namespace EonaCat.Connections.Models
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+namespace EonaCat.Connections.Models
 {
     public enum ProtocolType
     {
diff --git a/EonaCat.Connections/Models/Stats.cs b/EonaCat.Connections/Models/Stats.cs
index 064b879..78e0e9f 100644
--- a/EonaCat.Connections/Models/Stats.cs
+++ b/EonaCat.Connections/Models/Stats.cs
@@ -1,4 +1,7 @@
-namespace EonaCat.Connections
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+namespace EonaCat.Connections
 {
     public class Stats
     {
diff --git a/EonaCat.Connections/NetworkClient.cs b/EonaCat.Connections/NetworkClient.cs
index d608165..c222a61 100644
--- a/EonaCat.Connections/NetworkClient.cs
+++ b/EonaCat.Connections/NetworkClient.cs
@@ -1,4 +1,7 @@
-using EonaCat.Connections.EventArguments;
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+using EonaCat.Connections.EventArguments;
 using EonaCat.Connections.Helpers;
 using EonaCat.Connections.Models;
 using System.Buffers;
diff --git a/EonaCat.Connections/NetworkServer.cs b/EonaCat.Connections/NetworkServer.cs
index faf2e1d..a75732e 100644
--- a/EonaCat.Connections/NetworkServer.cs
+++ b/EonaCat.Connections/NetworkServer.cs
@@ -1,4 +1,7 @@
-using EonaCat.Connections.EventArguments;
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+using EonaCat.Connections.EventArguments;
 using EonaCat.Connections.Helpers;
 using EonaCat.Connections.Models;
 using System.Buffers;
diff --git a/EonaCat.Connections/Processors/JsonDataProcessor.cs b/EonaCat.Connections/Processors/JsonDataProcessor.cs
index 4e0b09b..8df9b77 100644
--- a/EonaCat.Connections/Processors/JsonDataProcessor.cs
+++ b/EonaCat.Connections/Processors/JsonDataProcessor.cs
@@ -1,4 +1,7 @@
-using EonaCat.Json;
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+using EonaCat.Json;
 using EonaCat.Json.Linq;
 using EonaCat.Connections.Models;
 using System.Collections.Concurrent;
diff --git a/EonaCat.Connections/Processors/JsonDataProcessorHelper.cs b/EonaCat.Connections/Processors/JsonDataProcessorHelper.cs
index bf8447d..2649fa3 100644
--- a/EonaCat.Connections/Processors/JsonDataProcessorHelper.cs
+++ b/EonaCat.Connections/Processors/JsonDataProcessorHelper.cs
@@ -1,4 +1,7 @@
-using System.Text;
+// This file is part of the EonaCat project(s) which is released under the Apache License.
+// See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
+using System.Text;
 
 namespace EonaCat.Connections.Processors
 {