It is an option in MegaEdit to enable a watermarked preview from within the editor that a user can download and send to another user/manager etc before sending through to print.
This setting can ONLY be enabled by an admin user - to activate go into the editor and click show menu :
Click product options (higlighted above) to go through to the section labelled PDF download support:
There are a number of settings that can be altered:
PDF Download: = This enables the PDF Preview
Watermark Text: = This is the watermark text that will populate your preview
Restrict printing: = This setting enables whether the pdf preview can be print locked or not
Max page count: = This setting allows you to create a multipage PDF preview -1 = ALL pages 1/2/3 restricts the number of pages that will be previewed.
The above button will appear in the top right of the editor when the settings above are configured.