However, the copyright holder can grant another party unlimited usage rights as well as waive the right to be mentioned as the actual copyright holder.
Both of these might apply here: SAP's and Deutsche Telekom's employees most likely have waived their right to be mentioned as individual copyright holders (which is a common stipulation in German employment contracts) while SAP and Deutsche Telekom have not, which is why they are mentioned as copyright holders instead of the Federal Republic of Germany.
However, the copyright holder can grant another party unlimited usage rights as well as waive the right to be mentioned as the actual copyright holder.
Both of these might apply here: SAP's and Deutsche Telekom's employees most likely have waived their right to be mentioned as individual copyright holders (which is a common stipulation in German employment contracts) while SAP and Deutsche Telekom have not, which is why they are mentioned as copyright holders instead of the Federal Republic of Germany.