During the Google Summer of Code in 2012, Gökçen Eraslan implemented digital signatures for LibreOffice's PDF export. There were some glitches left in the feature, for instance it did not really work well on Windows, which is where most of our users are. Because of that, the functionality was marked as "experimental" and was thus not easily available to users. Recently, thanks to a crowdfunding effort, we had the opportunity to improve this feature. The presentation will describe that work and show how to use the feature.