The LSAPR_SECURITY_DESCRIPTOR structure defines an object's security descriptor as specified in [MS-LSAD] section 2.2.3.4.

 typedef struct _LSAPR_SECURITY_DESCRIPTOR {
   unsigned char Revision;
   unsigned char Sbz1;
   SECURITY_DESCRIPTOR_CONTROL Control;
   PRPC_SID Owner;
   PRPC_SID Group;
   PLSAPR_ACL Sacl;
   PLSAPR_ACL Dacl;
 } LSAPR_SECURITY_DESCRIPTOR,
  *PLSAPR_SECURITY_DESCRIPTOR;

Individual member semantics are specified in [MS-LSAD] section 2.2.3.4.