Actually singings can be done in electronic books, take a little creativity but can be done. Let's consider a few scenarios:
I am an author who has sold a few copies of my latest electronic book and my publisher wants to do an on site signing. I go to the site with my tablet PC, and I create a digital image of my signature with software such as MS Word and save that. After my presentation I tell visitors to email their electronic copies to this address along with your own address. I take any copy I get in the email and copy the signature picture that I created to the PDF (Adobe Acroabt Writer will allow this) and email it back. Voila my customer is sitting there with a signed digital copy.
I embed a four digit code in the back of the electronic book. After my presentation customers can ask for a digital copy by recalling that digital code, proves they own the book. Anyone with a correct answer is emailed a digital signed copy.
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