$Document安全系统(DSS)$ 8-K - Current report Filed: 2019-02-22 AccNo: 0001493152-19-002427 Size: 93 KBItem 1.01: Entry into a Material Definitive AgreementItem 2.03: Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a RegistrantItem 9.01: Financial Statements and Exhibits 网页链接