The title Dr. rer. pol. may only be used after the award or handing over of the certificate.
The certificate can be collected from the office for doctoral affairs or the dean's office. Please make an appointment for this. You will be informed in good time about award ceremonies.
As a rule, doctoral degree certificates are not sent by post, as secure delivery by post - including registered mail - cannot be guaranteed. As there is just one original certificate, only a duplicate can be issued for a fee in the event of loss.
However, if you confirm in an informal letter with your original signature by post that you accept the risks of delivery by post, the certificate will be sent to you by registered mail with return receipt.
You can also have the certificate fetched by an authorised person. The person should be able to identify themselves and present an informal authorisation signed by you to collect the certificate.