Open- set UserPassword- Close -> invalid document

Aspose.PDF Product Family
1

The code is very straightforward, the resulting file cannot be opened in Acrobat Reader, the document is not a valid pdf (there was an error processing the page).

static void Main(string[] args)
{
Stream stream = new FileStream(@“C:\Documents and Settings\Administrator\My Documents\Bosch Crailsheim 20091202.pdf”, FileMode.Open);
Pdf pdf = new Pdf(stream);
pdf.Security = new Security {UserPassword = “1234”};
stream =
new FileStream(
@“C:\Documents and Settings\Administrator\My Documents\Bosch Crailsheim 20091202 secure.pdf”,
FileMode.OpenOrCreate);
//pdf.Save(stream);
pdf.Close();
stream.Close();
}
2

Hi Luca,

Thanks for your inquiry. Please note Aspose.Pdf.Generator namespace is used to create a file from scratch. You can use Aspose.Pdf.Generator.Security class only to set security setting of newly created file, so you are getting a corrupt file. To encrypt an existing file you can use Aspose.Pdf.Document or Aspose.Pdf.Facades namespaces. Please check following documentation links for the purpose. Hopefully it will help you to accomplish the task.

Please feel free to contact us for any further assistance.

Best Regards,

3

Hi Luca,

Thanks for using our API’s.

Adding more to Tilal’s comments, the above stated approach is Direct to File creation mode of Aspose.Pdf.Generator namespace. However you still want to create new PDF document using this approach to apply security restrictions (encrypt the file), please try using the following updated code:

For your reference, I have also attached the resultant PDF generated on my end.

C#

Stream stream = new FileStream(@“C:\pdftest\BoschCrailsheim20091202.pdf”, FileMode.CreateNew);
Pdf pdf = new Pdf(stream);
pdf.Security = new Security { UserPassword = "1234" };
pdf.Close();
stream.Close();