I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 109)

Section 8: Saving Documents
104
 Image. When you select this file type, Readiris doesn't execute
the text recognition on your document. Your PDF file will not be
text-searchable, it only contains the image of your original
document.
Version
In this drop-down list you can select which PDF version you want
to generate.
It takes Adobe Acrobat 5.0 and higher to open PDF 1.4 documents.
It takes Adobe Acrobat 6.0 and higher to open PDF 1.5 documents.
It takes Adobe Acrobat 7.0 and higher to open PDF 1.6 documents.
It takes Adobe Acrobat 8.0 and higher to open PDF 1.7 documents.
Conforms to PDF/A
This option generates PDF files that are suited for long-term
archiving. PDF/A stands for "Portable Document Format
Archivable". PDF/A files contain only what is strictly needed for
opening and viewing them.
Note that PDF/A is not supported with Asian languages.
Embed fonts
The option Embed fonts, embeds - or includes - the original fonts
of your documents in the PDF file. This way, other users will
always see the documents in their original fonts on their computer,
even if they don't have the particular font you used installed on their
computer.
Note that embedding fonts increases the file size of your output
documents.