I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 77)

Readiris TM Corporate 12 – User Guide
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and Image can be hyper-compressed by means of iHQC without
loss of image quality. iHQC stands for intelligent High-Quality
Compression, I.R.I.S.' proprietary, efficient compression
technology. iHQC is to images what MP3 is to music and what
DivX is to movies.
Select either Good size to obtain the smallest possible documents or
Good Quality to obtain slightly larger documents of higher quality.
Or select Custom and move the slider to set the right balance
between minimal size and maximal quality.
Note that it takes Adobe Reader to open iHQC-compressed PDF
files. They will not open correctly in the default Preview
application.
P ASSWORD PROTECTING PDF DOCUMENTS
Readiris allows you to limit access to PDF output by setting
passwords. You can enter an open document password, which will
be required to open the document and set a permissions password
which will restrict printing and editing of the document.
Warning: note that it takes password recovery software to recover
forgotten or lost passwords.
To apply password protection:
 Click the output format icon on the main toolbar and select PDF.
 Click the PDF Passwords tab and select the security settings of
your choice.