I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 76)

Chapter 9 – Formatting and saving documents
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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.
PDF/A documents
Next to "regular" PDF documents, Readiris offers PDF/A output.
Simply select the option Conforms to PDF/A.
PDF/A files are used for long-term archiving and contain only what
is strictly needed for opening and viewing them.
Note: use Adobe Reader instead the standard Preview application
to open PDF/A documents.
Embed fonts
Select the option Embed fonts to embed the fonts in PDF files.
Embedding fonts prevents font substitution and ensures that readers,
regardless of their computer configuration, see the text in its
original fonts.
Embedding fonts increases the file size of recognized documents
somewhat.
Create bookmarks
The option Create bookmarks creates bookmarks for each text
block, graphic and table in PDF files.
iHQC - intelligent High-Quality Compression
Besides four types of "regular" PDF output, Readiris offers iHQC
compressed PDF output: PDF documents of the types Image-Text