The usual way documents are signed, is to print them out then sign with an ink. However, it is also possible to sign your documents before you even print them out. This can be achieved with all versions of Microsoft Word.
Visit my blog and follow the written tutorial here: http://pixxycreativities.blogspot.com/2013/10/how-to-sign-your-word-documents-before.html
Method 2: https://www.youtube.com/watch?v=8BZDDyQn3l8
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