Remove digital signatures
flattensignature
##GITHUB:https://github.com/itext/i7js-examples/blob/develop/src/main/java/com/itextpdf/samples/sandbox/acroforms/FlattenSignature.java##
##GITHUB:https://github.com/itext/i7ns-samples/blob/develop/itext/itext.samples/itext/samples/sandbox/acroforms/FlattenSignature.cs##
Resources
https://github.com/itext/i7js-examples/blob/develop/src/main/resources/pdfs/input_signed.pdf