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You can edit it in Adobe Acrobat Reader DC<br />
You need a PRO (paid) version to digitally sign the document.
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naseeam

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Adobe V9 is very old. <br />
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If the PDF is editable text upon creation, you can open it with Adobe Acrobat DC, click on Tools, Edit PDF and then double click on fields and edit them. I just did this with Adobe Acrobat DC V2015.
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Also I think it is not possible to modify a digitally signed document. It will loose its validity
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That is probably true. I was using a plain document
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There was an equivalent word file. &nbsp;I edited it and saved it as pdf.
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What is a process for editing a pdf file? &nbsp;I have a pdf file that is digitally signed. &nbsp;I need to create very similar pdf file. &nbsp;How do I go about doing that?<br />
I have Adobe Acrobat version 9.5.5. &nbsp;Do I open the pdf file in Abode and edit it or do I need to open it in some other program. &nbsp;what is the process?
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What is a process for editing a pdf file?  I have a pdf file that is digitally signed.  I need to create very similar pdf file.  How do I go about doing that?
I have Adobe Acrobat version 9.5.5.  Do I open the pdf file in Abode and edit it or do I need to open it in some other program.  what is the process?

What is a process of editing pdf files?

A Portable Document Format (PDF) is a file format consisting of an electronic image resembling a printed document and can be viewed, printed, and electronically transmitted. PDF files can store various types of data, including formatted text, vector graphics, and raster images. The page layout defines the location, size, and shape of each page and each item on the page. The information looks the same no matter what device or program is used to open it.

Adobe Acrobat is a family of application software and Web services developed by Adobe Systems to view, create, manipulate, print and manage files in Portable Document Format (PDF). The family comprises Acrobat Reader (formerly Adobe Reader), Acrobat (formerly Acrobat Exchange) and Acrobat.com. The commercial proprietary Acrobat, available for Microsoft Windows and OS X only, can also create, edit, convert, digitally sign, encrypt, export and publish PDF files.

Adobe Acrobat

Microsoft Word is a commercial document editing program that is part of the Microsoft Office suite. It features numerous text-editing tools for creating richly formatted documents, along with tools for the use of macros in Word documents. Word's native file formats are denoted either by a .doc or .docx file extension. Plugins permitting the Windows versions of Word to read and write formats it does not natively support, such as the OpenDocument format (ODF) are available. Word can import and display images in common bitmap formats such as JPG and GIF. It can also be used to create and display simple line-art.