diff --git a/Source/AaxDecrypter/IDownloadOptions.cs b/Source/AaxDecrypter/IDownloadOptions.cs
index be630e85..fb22350e 100644
--- a/Source/AaxDecrypter/IDownloadOptions.cs
+++ b/Source/AaxDecrypter/IDownloadOptions.cs
@@ -19,9 +19,9 @@ namespace AaxDecrypter
         public KeyData(string keyPart1, string? keyPart2 = null)
         {
             ArgumentNullException.ThrowIfNull(keyPart1, nameof(keyPart1));
-            KeyPart1 = Convert.FromBase64String(keyPart1);
+            KeyPart1 = Convert.FromHexString(keyPart1);
             if (keyPart2 != null)
-                KeyPart2 = Convert.FromBase64String(keyPart2);
+                KeyPart2 = Convert.FromHexString(keyPart2);
         }
 	}    
 
diff --git a/Source/FileLiberator/DownloadOptions.cs b/Source/FileLiberator/DownloadOptions.cs
index 3f55abe2..86777021 100644
--- a/Source/FileLiberator/DownloadOptions.cs
+++ b/Source/FileLiberator/DownloadOptions.cs
@@ -108,8 +108,8 @@ namespace FileLiberator
 			ContentMetadata = licInfo.ContentMetadata;
 			InputType
 			= licInfo.DrmType is AudibleApi.Common.DrmType.Widevine ? AAXClean.FileType.Dash
-			: licInfo.DrmType is AudibleApi.Common.DrmType.Adrm && licInfo.DecryptionKeys?.Length == 1 && licInfo.DecryptionKeys[0].KeyPart1.Length == 8 && licInfo.DecryptionKeys[0].KeyPart2 is null ? AAXClean.FileType.Aax
-			: licInfo.DrmType is AudibleApi.Common.DrmType.Adrm && licInfo.DecryptionKeys?.Length == 1 && licInfo.DecryptionKeys[0].KeyPart1.Length == 32 && licInfo.DecryptionKeys[0].KeyPart2?.Length == 32 ? AAXClean.FileType.Aaxc
+			: licInfo.DrmType is AudibleApi.Common.DrmType.Adrm && licInfo.DecryptionKeys?.Length == 1 && licInfo.DecryptionKeys[0].KeyPart1.Length == 4 && licInfo.DecryptionKeys[0].KeyPart2 is null ? AAXClean.FileType.Aax
+			: licInfo.DrmType is AudibleApi.Common.DrmType.Adrm && licInfo.DecryptionKeys?.Length == 1 && licInfo.DecryptionKeys[0].KeyPart1.Length == 16 && licInfo.DecryptionKeys[0].KeyPart2?.Length == 16 ? AAXClean.FileType.Aaxc
 			: null;
 
 			//If DrmType is not Adrm or Widevine, the delivered file is an unencrypted mp3.