The resolutions of the general meeting of a public limited company must be notarised. General meetings of non-listed companies do not need to be notarised if no resolutions are passed. However, if resolutions are passed, such as amendments to the articles of association, they must be notarised by a notary public.
"Every resolution of the general meeting shall be certified by a notarial record of the proceedings." (§ 130 AktG)