The legal basis for this processing, the mandatory data, is Art. 6 para. 1 lit. b DSGVO, implementation of a pre-contractual measure. The processing of data voluntarily provided by you is based on Art. 6 para. 1 lit. f DSGVO. According to this, processing is permissible that is necessary to protect our legitimate interests. Our legitimate interest is to be in contact with you, our customers, to improve our quality of advice and to be able to contact you more easily in case of possible queries.