Auto Conversion to PDF, Zip
System can create PDF-version of each documents uploaded in Document Library.
System can also create ZIP-version of each document.
This feature is disabled by default.
The PDf-version of each document will be useful when you don't want to share original documents to other users.
The Document owner can decide who can view the original document, and who can view the PDF-version of document.
Following is the setting screenshot: