On Mon, 20 May 2013 14:33:54 +0200, mursitorhan <mursitor...@hotmail.com>  
wrote:

> The same problem exists in 5.4.1 version.

Well, you have the same problem if you twist the question!

> in I text if you want to have multiple signature you must create stamper
> like this
> PdfStamper stp = PdfStamper.CreateSignature(reader, output, '\0',null,
> true);
> but
> stp.SetEncryption(chain, new int[] { PdfWriter.ALLOW_FILL_IN },
> PdfWriter.ENCRYPTION_AES_128);

That's not what you originally asked!
In your original question, you were asking:

Step 1:
firstly I encrypted the pdf file. Then I reopened the encryted file and  
check whether it is encrypted correctly.

THIS IS NOT DONE IN APPEND MODE!

Step 2:
After that I appended two signature and save it in another name. When I  
try to open this file I can see that it was encrypted and had two  
signature there was no corruption about signatures.

THIS IS DONE IN APPEND MODE!

In other words: you're asking one thing, doing another thing, and then you  
complain that it's not working.

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