Software license key and activation

http://stackoverflow.com/questions/16222674/software-license-key-and-activation
https://github.com/Labs64
http://www.codeproject.com/Articles/11012/License-Key-Generation
https://ellipter.com/
https://technet.microsoft.com/en-us/library/dd346641(v=ws.10).aspx
https://code.msdn.microsoft.com/windowsapps/Product-Key-Activation-to-16c92174/view/SourceCode
https://activatar.codeplex.com/
http://dotlicense.codeplex.com/
http://www.codeproject.com/Articles/15496/Application-Trial-Maker
http://www.c-sharpcorner.com/article/a-simple-approach-to-product-activation/
http://www.codeproject.com/Articles/35009/How-to-Generate-and-Validate-CD-Keys-for-your-Soft
https://licensekeygenerator.codeplex.com/

http://softwareprotector.codeplex.com/

http://skgl.codeplex.com/

http://dotlicense.codeplex.com/

 

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public static class Activation {       #region  Redegit Key       public static  void MakeRegeditActivationCode()     {         Registry.CurrentUser.CreateSubKey(@"SOFTWARE\Activation");     }       public static string ReadRegeditKey()     {         try         {             RegistryKey myKey = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Activation", true);             return myKey.GetValue("ActivationCode").ToString();         }         catch         {             SetRegeditKeyValue("");             return null;         }     }       public static void SetRegeditKeyValue(string value)     {         RegistryKey myKey = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Activation", true);         myKey.SetValue("ActivationCode", value, RegistryValueKind.String);     }       #endregion       #region Get Hardware Information       public static string GetMacAddress()     {         string macAddresses = "";           foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())         {             macAddresses = nic.GetPhysicalAddress().ToString();             break;         }         return macAddresses;     }       public static string GetCpuId()     {         string cpuid = null;         try         {             ManagementObjectSearcher mo = new ManagementObjectSearcher("select * from Win32_Processor");             foreach (var item in mo.Get())             {                 cpuid = item["ProcessorId"].ToString();             }             return cpuid;         }         catch         {             return null;         }     }       #endregion       #region Hash Function       public static string MyCustomHash(string input)     {         System.Security.Cryptography.MD5CryptoServiceProvider x = new System.Security.Cryptography.MD5CryptoServiceProvider();         byte[] bs = System.Text.Encoding.UTF32.GetBytes(input);         bs = x.ComputeHash(bs);         System.Text.StringBuilder s = new System.Text.StringBuilder();         int select = 1;         foreach (byte b in bs)         {             switch (select)             {                 case 1:                     s.Append(b.ToString("x4").ToLower());                     break;                 case 2:                     s.Append(b.ToString("x3").ToLower());                     break;                 case 3:                     s.Append(b.ToString("x2").ToLower());                     break;                 case 4:                     s.Append(b.ToString("x1").ToLower());                     break;                 default:                     break;             }             select++;             if (select > 4) select = 1;         }         string password = s.ToString();         return password;     }       #endregion   }