I have Adobe Reader X, and converted a regular PDF to a "Text PDF" file. When I have the file open, I can move the cursor around but I can't type anything in or make any modifications. Almost as if the document is protected? What do I need to do to be able to modify the text PDF file?
Claudio is being unusually succinct. You can not edit a pdf file using Adobe Reader. You have some editing tools available with the commercial Adobe Acrobat programs.