After much talk about chess, a short switch to another hobby of mine: ebooks. With a jealous eye I always looked at the Kindle page of Amazon. It has by far the widest offer of ebooks. Usually I look around for something new and when I see that a book is available in electronic format, I check other sites if they offer it in a normal format for my ebook reader. You might already guess the sad truth – very often the book was available in Kindle format only.
To my great joy I found out that Amazon offers a Kindle reader application for the PC. The books are based on the Mobipocket format so the next question was: can I get the books working on my reader? Obviously I have missed much of the latest progress and the trouble the people went through to make it work but thanks to skindle it is possible to break the protection scheme and to create a normal Mobipocket book (which can be converted to HTML).
It’s interesting to notice here that the required PIDs to encrypt a book are only used one time and are generated for each book. They are also not limited to uppercase characters and numbers but make use of the whole alphabet. A generic brute-force attack (see my previous entry) is no longer feasible. On the other hand it’s amazing that people were able to figure out how to calucate the PID that is used. According to this link, it’s not so difficult at all but believe me, using a disassembler is very time consuming and requires a good portion of knowledge.
The final question is of course: is it legal? The Terms of use clearly state that it is not. You may only use the digital contents on the PC or on an authorized device. That really sucks. In addition, it makes a difference from which country you are. The price for US citizens can be lower and sometimes there are regional restrictictions as well. I noticed this first when I wanted to buy a Vonnegut book from Fictionwise. It was a frustrating experience to browse the online catalog and to be told that you cannot have the ebook. While Amazon only requires you to fill in an address, Fictionwise cannot be fooled that easily because they read the country information from the credit card number.
I don’t mind DRM and I respect that authors own the copyright but I don’t understand the way ebooks are treated and sold.