Germany’s Transexuality Law or TSG (‘Transsexuellengesetz’) was adopted in 1981 following a Federal Constitutional Court ruling that gave trans people the lawful option to adjust their first name and legal gender officially. In addition to the two paragraphs that address the name and legal gender modification, the law also includes a disclosure-ban (‘Offenbarungsverbot‘) that is supposed to protect trans people from others being able to conclude that their first name and legal gender were different once.
Adjustments carried out based on an official change in name and/or gender marker in accordance to this law may not only influence newly issued documents – like new passports, IDs or driving licenses–, but also allow to modify records all the way back to the birth certificate. Diplomas, work references and other documents may be adjusted as well.
Since 1981, the law has been amended multiple times due to Federal Constitutional Court rulings that have declared several elements unconstitutional. Until 2011, trans people were required to provide a proof of infertility in order to have their gender marker changed. The law is still heavily criticised.