One way of obtaining proof of identity is to use digital pads that capture people's signatures.
一种获得认证的方式是使用可以抓取个人签名的数字板。
For instance, the paper version of Harry Potter sells for 15 dollars while fans can download its digital version to their Kindles or i-pads at a significantly cheaper price.
例如，哈利·波特的纸质版本要卖到15美元，而粉丝们却能以一个相当便宜的价格下载它的数字版到他们的kindle或者ipad上面。
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