Electronics and ereader maker Sony is emailing customers to promote the new Harry Potter ebook range.
J.K. Rowling’s novels launched on the format earlier this week and are compatible with all major ebook readers including Sony’s own range, Amazon’s Kindle and Apple’s iBooks app.
Instead of traditional DRM, books are personalised “with a combination of watermarking techniques that relate to the book, to the purchaser and the purchase time” to help combat piracy.
The books are available exclusively via the Pottermore.com website which was launched by Rowling and Sony last year.
Launching the site last year, Ms Rowling said: “I wanted to give something back to the fans that have followed Harry so devotedly over the years, and to bring the stories to a new digital generation. I hope fans and those new to Harry will have as much fun helping to shape Pottermore as I have.”