a. When you visit our website, we store certain information about the browser and operating system you use, the date and time of your visit, the access status (e.g. whether you were able to access a web-site or received an error message), the use of website functions, the search terms you may have entered, the frequency with which you access individual websites, the designation of files accessed, the amount of data transferred, the website from which you accessed our websites and the website which you visit from our websites, either by clicking on links on our websites or by entering a do-main directly in the input field of the same tab (or the same win-dow) of your browser in which you opened our websites. We also store your IP ad-dress and the name of your Internet service pro-vider for seven days for security reasons, in particular to prevent and detect attacks on our websites or attempts at fraud.
b. We only store other personal data if you provide this data, e.g. as part of a registration, a contact form, a survey, a price competition or for the execution of a contract, and even in these cases only in-sofar as this is permitted to us on the basis of a consent given by you or in accordance with the applicable legal provisions (further information on this can be found below in the section "Legal basis of processing").
c. You are not legally or contractually obliged to make available your personal data. However, it is possible that certain functions of our websites depend on the availability of personal data. If you do not make available personal data in these cases, this may result in func-tions not being available or only being available to a limited extent.