In a move to help combat piracy, eBook merchants in The Netherlands are going to begin adding unique digital watermarks to the digital books that they sell in order to track the individual copies of eBooks down to the user.

In order to do this, they must hand over customer data to an anti-piracy group. Torrent Freak has more:

The agreement will see vendors connected to the eBoekhuis platform share previously-private customer data directly with copyright holders and anti-piracy group BREIN. This means that should digital books turn up on BitTorrent networks or Usenet for example, with a minimum of fuss BREIN will be able to match the embedded watermarks with the customer who bought them. According to the document seen by EReaders.nl, eBook vendors will be required to store customer transaction data and make it available to BREIN and rightsholders for a minimum of two years.

Customers will be informed that their data will be attached to the file that they purchase and shared with the anti-piracy group at the point of sale.