Node Connectivity
There are 1178 nodes that can be used as predessesor
for a node with an input port of type 
org.knime.core.node.port.AbstractSimplePortObject.
Page Rotation
Checks if a PDF is of a certain rotation
Page Count
Checks if a PDF is greater, less or equal to a setPageCount
File Size
Checks if a PDF is a set file size
Contains Text
Checks if a PDF contains set text, returns true if does
Contains Image
Checks if a PDF contains an image
Validate Signature
Validate PDF Digital Signature
Sanitize PDF
Sanitize a PDF file
Remove Password
Remove password from a PDF file
Remove Cert Sign PDF
Remove digital signature from PDF
Get PDF Info
Summary here