Just one question, on the esellrate payment site, I have to enter my personal information (adress, tel. number etc.).
Well, I guess you should really raise this question to Esellerate, since they are the N.1 worldwide leader in ecommerce (Esellerate=Digital River), I'm sure they can handle your data in the proper way.
We surely need a valid email address, especially with PayPal payment, were you need to manually register the serial number so, if you supply a fake email address, you might have troubles activating the product, since the email with the serial number will never reach you. And, if we can't reach you via email, we might have troubles finding your order in case you'll ever need support, like a manual reactivation when you exceed your available activations or anything related to your order we might have to handle.