While the site’s content has been created with great care, I do not take any liability for it. Please contact me before using any of the material.

All rights reserved. Copyright ©2013–2019 by Hans-Jörg Ehren.


Except for web server log files, this site does not store any information about visitors. Keeping server logs is a standard procedure for hosting providers, done in order to allow for an investigation after a security breach. For each visit, IP address, date / time stamp, URL visited, HTTP protocol, HTTP status, bytes transmitted, referrer URL, and OS / browser are stored. After a maximum of seven days the logs are deleted routinely.


If you have any suggestions, questions or other feedback, I would love to hear from you by e-mail.