Printout of Electronically Signed Documents

In the first version of the mobile phone signature, the signature block (the visible "stamp") still contained the field "Signaturwert", which could be used to check relatively easily via www.signaturpruefung.gv.at whether this was a valid signature value and to which document this signature block belonged.
In the newer versions, this no longer exists, i. e. when printing a document, it is no longer possible to determine from an existing signature block whether the document was validly signed or whether only an image was inserted that looks like a signature block - example:

Furthermore, it must be checked whether an existing, valid signature actually matches the signature block printed on it:

Even the note "Unterschrieben und alle Unterschriften sind gültig" could be built into the PDF file as an image and thus be forged.

So if you have to print an electronically signed PDF (and you don't want to or can't keep the original - i. e. the electronically signed PDF), it is necessary either to note on the printout (with signature) that you have verified the electronic signature (and also, However, according to § 20 E-GovG, verification of the printout of an officially signed document can only be performed at the location specified in the signature block.
Without such a note, the printout of the PDF is at best like an uncertified copy of a manual signature (see below).

Where you can do this verification online should be given in the signature block (if one is printed - this is not legally necessary except for officially signed documents), otherwise you can also verify it locally e. g. with Adobe Reader or online on the homepage www.signaturpruefung.gv.at, there you can also print out a verification report and file it with the printout of the document.

If you open the PDF linked above with a suitable PDF reader (e. g. Adobe Reader) or upload it to www.signaturpruefung.gv.at, you will notice that it is not electronically signed at all, there is only the image (with fake name) that looks like it is a valid signature block:

Just like this signature is just a copy that says nothing about this website:

    Sebastian Kurz, Public domain, via Wikimedia Commons