Security Support Provider Interface (SSPI) provides a common interface between transport-level applications such as remote procedure call (RPC), and security support providers (SSPs) such as Windows Distributed Security. SSPI allows a transport application to call one of several security packages within an SSP to obtain an authenticated connection.可选的参数，主要用于你的数据连接可能进行远程调用的时候给你安全的检测！
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