1 Introduction

When someone asks me to sign a letter, I usually add a picture (facsimile) of my signature and return the document by email. This is always accepted. I do not run any risk by doing this. If a third party uses a copy of a person’s signature on a document without permission, that person is obviously not responsible or bound by any agreement. However, facsimiles of signatures pose a problem for the receiver, because it is difficult to determine whether they have been added by the right person or not.