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Cannot convert a secured but not password-protected pdf file

I tried to generate a preview of the first page a secured pdf file. The file is only secured and is not password protected. But I got an PasswordProtectedException exception.

public byte[] GeneratePreview(byte[] fileContent)
var name = Guid.NewGuid().ToString();
var saveOptions = new ImageSaveOptions
ConvertFileType = ImageSaveOptions.ImageFileType.Jpg,
OutputType = OutputType.Stream,
UsePdf = false,
Dpi = 72,
PageNumber = 1,
NumPagesToConvert = 1,
Width = 350,
Height = 500,
CustomName = name,
UseWidthForCustomName = false,
var conversionHandler = new ConversionHandler(GroupDocsConfig.ConversionConfig.Value);
var stream = conversionHandler.Convert<IList>(new MemoryStream(fileContent), saveOptions)[0];

stream.Seek(0, SeekOrigin.Begin);

var bytes = new byte[stream.Length];
stream.Read(bytes, 0, (int)stream.Length);

return bytes;
catch (Exception ex)

Message = "Exception of type 'GroupDocs.Conversion.Exception.PasswordProtectedException' was thrown."


at . [T](LoadOptions , SaveOptions )
at GroupDocs.Conversion.Handler.ConversionHandler. [T](Stream , , LoadOptions , SaveOptions )
at GroupDocs.Conversion.Handler.ConversionHandler.Convert[T](Stream fileStream, LoadOptions loadOptions, SaveOptions saveOptions)
at GroupDocs.Conversion.Handler.ConversionHandler.Convert[T](Stream fileStream, SaveOptions saveOptions)
at xxx.yyy.Service.Preview.PreviewServiceBase.GeneratePreview(Byte[] fileContent) in E:\Code\yyy\xxx.yyy.Services\Preview\PreviewServiceBase.cs:line 35

Hi leap,

I’m sorry to hear that you have such issue. Kindly Provide us the Problematic Pdf file this will help us in reproducing of this issue.
We are investigating and reproducing this issue. Once done we will get back to you.

Thank you for your patience.

Best Regards,