The document stream used to validate if that stream is signed.
Return Value
True if the input document stream contains at least 1 digital signature, false otherwise.
Requirements
Target Platforms: Windows 11, Windows 10, Windows 7, Windows, 11, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2