Laserfiche does provide access to the signature data, allowing for re-drawing it anywhere, which is useful. But to get it on a PDF it still requires a third party library with rights to draw on a PDF.

The third party library we use is a bit costly but solid, it has been deployed to multiple customers including one that has been processing hundreds of submissions a day for over a year.

You define the size and location for it to draw the signature and then just use the standard fill PDF activity from there to fill the rest of the fields.

It does "draw" the signature, not just copy an image of it, which means if it touches the line or other characters there is no "white space" created around it.