This dialog box appears if you click the Overlay button in the Kofax PDF Create Properties dialog box when Overlay with existing file is selected in the "If File Exists" selection box under Destination.
The Overlay dialog box will also appear with the following settings:
Show warning dialog is selected in the "If File Exists" selection box and you intend to save the resulting PDF under an existing file name. In the warning dialog box that appears select Overlay with existing file and then click the Overlay Options button.
Merge Rules
Choose a location from both selection boxes to adjust overlay between a newly created page and an existing page.
Place newly created pages as "Foreground"
Select this to place the original page in the background, and the newly created page in the foreground to have it on the top of the original page content. It can be useful e.g. you want to place a logo on a document.
Repeat last page of the shorter document for page overlay
Select this to put e.g. a header / footer or a logo on each page of a longer document. The last page of the shorter document must contain the header / footer or logo to be repeated.
Use existing file's "Document Settings" for newly created file
The newly created file will inherit the Document Settings of the existing file if it is a PDF and this checkbox is selected. If not selected, the default values will be used. This option is useful if you want to add a set of document settings (common properties) to several PDF files. You might put e.g. common keywords or subject into an overlay PDF file and apply this overlay with all files having these properties in common. These document settings get automatically inherited in all PDF files created with this overlay, so you do not have to add them each time.