The topic of data protection is comprehensively regulated by the EU General Data Protection Regulation (GDPR). To help you understand which data I collect from you, how I process it, what I do to protect your data, and whom to contact if you have any questions, I have put together all the relevant information on this page.


The person responsible according to the GDPR is:

Rolf Koizumi

This privacy policy applies to the website


Personal data is any information that relates to an identified or identifiable natural person. This includes, for example, information such as your name, age, address, phone number, date of birth, e-mail address, IP address, or user behavior. Information that we can not relate to your person (or only with disproportionate effort), e.g. by anonymizing the information, are not personal information. The processing of personal data (eg. collecting, querying, using, storing or transmitting) always requires a legal basis or your consent. Processed personal data will be deleted as soon as the purpose of the processing has been achieved and no legally required retention requirements have to be maintained.

If I process your personal data for the purpose of providing certain offers, I will subsequently inform you of the specific transactions, the scope and purpose of the data processing, the legal basis for the processing and the respective retention period.


When using this website, I may create web server logs that contain the date and time, the retrieved URL path, the referrer (if applicable) and the browser used; However, I anonymize your IP address using IP masking, so that I do not collect any personal data.


Regarding my hosting service, I do not share personal information with third parties.


I do not use any cookies on the public parts of this website.


I do not use any external tracking and analysis tools.

I do use Matomo, an open-source software for statistical analysis of visitor traffic. The data is processed and stored exclusively by myself. I have Matomo configured not to set any cookies. Matomo forms pseudonymized user profiles that allow me to evaluate the use of this website and to help me making my website better. The creation of pseudonymous user profiles is already limited by the waiver of cookies; In particular, Matomo considers every new website visit, if it comes from a new IP address, as a new visit and does not associate it with your previous visits. I don’t share this information with third parties. The IP address will not be associated with any other data concerning you. I prevent being able to assign your IP address with your person by anonymization via IP masking. Matomo is configured on this website to honor a “Do-Not-Track” setting you make in your browser. If you do not agree with the storage and evaluation, please activate the “Do-Not-Track” setting of your browser.


I do not use any plugins of social networks.

You may occasionally find links to other websites on this website. By activating these links you will be redirected to the website of another operator, which you can recognize by the changed URL in the browser. I have no control over their content and therefore do not have any responsibility for how those other websites handle your personal information. I have not checked if the operators of those websites comply with the GDPR. Please inform yourself about it.