Stamp the existing pdf file and save it again
<p>I want to stamp first page of any existing pdf file with any text enter by the user and save it again or overwrite the file. I found some article about it on google but all are either create a new pdf file or save the stamped file in new pdf file. I want to save the stamping in existing file.<br/>
Have you any suggestions or source code.</p>

<p>Thanks in advance<br/>
Dinesh Kumar</p>
