@byblo I don't want to debate, from your point of view you are right, you buy the device.
But from Kobo: you buy the device but not the software on it.
The same with a tablet or phone, If I buy it, why can't I buy a rooted one.
I buy a book, I can share it, I can sell it, I can do with it what I want, but a e-book is a totally other story, I buy a Microsoft program, it is my property, but I can't sell it, I can't put the same program on my laptop.
I buy a passport, but it always stays property of the government... so just say, I pay for it, I can do whatever I want with it isn't that clear.
You buy the reader,but got a license to use the software, you don't own the software.
We think very easy,I pay for it,it is my property,but don't try to use this logica in court
I have a dutch dictionary that is in epub format, I can use the search on the book to get all I want, maybe there is something for you in French ?