On Mon, 20 May 2013 09:58:50 +0200, mursitorhan <mursitor...@hotmail.com>  
wrote:

> Using adobe reader I can do this.

Are you claiming that you can do the following things simulaneously:

1. Create a signature in append mode using Adobe, meaning that you keep  
the bytes of the original PDF intact.
2. Encrypt the bytes of the original PDF.

This is a contradiction.

Either you keep the bytes of the original PDF intact, or you encrypt them.  
You can't have both.
You'll have to clarify.

Also, tell us which version of iText you're using. I have the impression  
you're using an old version.

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