"1998Z"^^ . "acquired by VASCO Data Security International in 2010; declared bankrupt in 2011"@en . . . . "DigiNotar was a Dutch certificate authority owned by VASCO Data Security International. On September 3, 2011, after it had become clear that a security breach had resulted in the fraudulent issuing of certificates, the Dutch government took over operational management of DigiNotar's systems."@en . . . . . "2011-09-20Z"^^ . . "2011Z"^^ . "DigiNotar BV"@en .