A digitally signed document remains original as long as it is kept into the digital format. (It can be renamed, but it cannot be converted into another form such as zipping it as it may invalidate the signature)
A printed digitally signed document is considered as a copy and cannot be trusted.
The digital signature can be either visible or invisible. For the convenience of the signature validation, we strongly recommend using visible digital signature.
Any manipulation of the print of a digitally signed document, does not revive the trust of the initial digital signature that were applied to it before the printout.
