"Obviously a lot of work went into Master PDF Editor. However, this is not enduser-friendly. $69 for so much effort to go through support to find out how to do simple things is not a good value. LibreOffice works fine for simply signing a pdf document by using GIMP to draw a signature, exporting as a .png image, then importing that image into a document. I purchased Master PDF Editor to more easily sign and edit pdf forms, expecting to use additional features in the future. But no. This was not a good decision. Instructions are not presented clearly. Support is less than helpful. Eight emails asking "