Workaround to solve the problem:
The required standard authorizations can be viewed in k3b under Settings --> programs --> permissions (see picture below)
The required rights and group membership can be set with the following commands.
sudo chmod 4710 /usr/bin/cdrdao
sudo chmod 4710 /usr/bin/cdrecord
sudo chmod 0750 /usr/bin/growisofs
sudo chmod 4710 /usr/sbin/cdrdao
sudo chmod 4710 /usr/sbin/cdrecord
sudo chmod 0750 /usr/sbin/growisofs
sudo chmod 4710 /sbin/cdrdao
sudo chmod 4710 /sbin/cdrecord
sudo chmod 750 /sbin/growisofs
sudo chown root:optical /usr/bin/cdrecord
sudo chown root:optical /usr/bin/cdrdao
sudo chown root:optical /usr/bin/growisofs
Finaly I add my user to GROUP optical:
sudo usermod -g optical <MyUserName>