Well, I have a scanned PDF with some slightly changes made by hand and a source file. I wish to make a PDF, which would be searchable (based on the text from the source, the changes would remain as they are). I am searching a free (and even better - portable) software which would allow me to somehow "combine" the images from a scan and the text from the source DOC file. So it SEEMS like the image is selectable and searchable.