function ValidateActivationFile(const FileName: string): Boolean; var Lines: TStringList; Decoded, MachineIDPart, HashPart, CalculatedHash: string; Parts: TArray<string>; begin Result := False; if not FileExists(FileName) then Exit; Lines := TStringList.Create; try Lines.LoadFromFile(FileName); if Lines.Count = 0 then Exit; Decoded := TNetEncoding.Base64.Decode(Lines[0]); Parts := Decoded.Split(['|']); if Length(Parts) < 3 then Exit;
uses System.NetEncoding, System.Hash; function GenerateActivationFile(const MachineID, UserEmail: string; ExpireDays: Integer): string; var ExpireDate: TDateTime; RawData, HashData: string; begin ExpireDate := Now + ExpireDays; RawData := Format('%s|%s|%s', [MachineID, UserEmail, DateToStr(ExpireDate)]); HashData := THashSHA2.GetHashString(RawData, SHA256); Result := TNetEncoding.Base64.Encode(RawData + '|' + HashData); // Save Result to a file, e.g., "activation.key" end; file activation delphi 2016
On activation, your server returns this encoded string as a .key or .lic file. When your application starts, locate the activation file and validate it. On your server (or within an admin tool),
MachineIDPart := Parts[0]; HashPart := Parts[High(Parts)]; Delphi's TCipher_AES from System.Encryption ).
// Optional: Check expiration date if StrToDateDef(Parts[2], 0) < Now then Exit;
uses Winapi.Windows, System.SysUtils, System.Classes; function GetMachineID: string; var VolumeSerial: DWORD; MaxCompLen, FileSysFlags: DWORD; RootPath: string; ComputerName: array[0..MAX_COMPUTERNAME_LENGTH + 1] of Char; Size: DWORD; begin RootPath := 'C:'; GetVolumeInformation(PChar(RootPath), nil, 0, @VolumeSerial, MaxCompLen, FileSysFlags, nil, 0); Size := MAX_COMPUTERNAME_LENGTH + 1; GetComputerName(ComputerName, Size); Result := Format('%d-%s', [VolumeSerial, string(ComputerName)]); end; ⚠️ Note: For production, combine multiple identifiers (MAC address, processor ID) to avoid false positives. On your server (or within an admin tool), encrypt the machine ID along with expiration date and features. Use System.NetEncoding and a strong cipher (e.g., Delphi's TCipher_AES from System.Encryption ).