データ発信 はっしん もと認証 にんしょうではありませんでした
dētahasshimmoto ninshōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of データ発信元認証

1. Was not data source authentication.; Was not verified as the data source.

Past/Perfective
Negative
Polite
Formal Register
Computing