Perfect PDF Reader functionality:
* open, read, display any PDF file
* print PDF documents
* export PDF as plain text
* export PDF by the page as images (not available in Adobe Reader!)
* great number of navigation and display modes, zoom
* rotate pages
* send PDF file via email
* extract text and images
* clipboard
* search function with appropriate options
* fill, save and send PDF forms (not available in Adobe Reader!)
* digital signatures
