It literally translates to "federal data protection law" and has been German law since 1978. In certain conditions it has also mandated a DPO (https://de.wikipedia.org/wiki/Datenschutzbeauftragter) since then, but in fact the first DPO position in Germany was created in 1971.
The right to be forgotten is mandated by article 35 BDSG (https://www.gesetze-im-internet.de/bdsg_1990/__35.html).
The right to a data export is mandated by article 34 BDSG (https://www.gesetze-im-internet.de/bdsg_1990/__34.html). It has always been common use this law to get a free copy of the data which our credit reporting agencies have about you, I've done that multiple times.