During the subscription process we collect personally identifiable information: both the information you fill in the subscription form yourself and information collected automatically (IP address, your country based on your IP address and your browser's user agent string). This is a legal requirement per European Directive 2011/83/EU; we are required to collect it to prove to the tax authorities that we have charged you the correct tax amount. This information is considered part of the invoicing information of your transaction and cannot be erased until we are legally allowed to remove invoices, typically 10 years after the transaction has taken place.