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pDoc->SetStdEncryption(SEM_AV10, VARIANT_TRUE, PermF_User - PermF_Edit - PrivPermF_DocAssembly, L"111", L"123");

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//Class of the callback for the document authorization (if you don't have any documents with passwords you don't need it)
class ATL_NO_VTABLE CDocAuthCallbackImpl : public CComObjectRootEx<CComSingleThreadModel>, public ATL::IDispatchImpl<IPXC_DocAuthCallback, &__uuidof(IPXC_DocAuthCallback)>
{
public:
	CDocAuthCallbackImpl() {}
	~CDocAuthCallbackImpl() {}
public:
	DECLARE_PROTECT_FINAL_CONSTRUCT()

	BEGIN_COM_MAP(CDocAuthCallbackImpl)
		COM_INTERFACE_ENTRY(IPXC_DocAuthCallback)
		COM_INTERFACE_ENTRY(IDispatch)
	END_COM_MAP()
public:
	STDMETHODIMP AuthDoc(IPXC_Document* pDoc, ULONG_T nFlags) override
	{
		if (!pDoc || !m_pxsInst)
			return E_INVALIDARG;
		//Checking whether the document has any security
		ULONG_T nNameAtom = 0;
		pDoc->GetSecurityHandlerType(VARIANT_FALSE, &nNameAtom);
		if (nNameAtom == 0)
		{
			//No security so successfully opened doc
			//...
			return S_OK;
		}
		//Else we must provide a password
		ULONG_T nStandard = 0;
		m_pxsInst->StrToAtom(L"Standard", &nStandard);
		PXC_PermStatus status = Perm_ReqGranted;
		//Comparing whether the security handler type is Standard
		if (nStandard != nNameAtom)
		{
			//We do not support this one
			return E_INVALIDARG;
		}

		pDoc->AuthorizeWithPassword(L"YourPasswordHere", &status);
		if (status != Perm_ReqGranted)
		{
			//We don't have permission to open doc
			return E_FAIL;
		}
		return S_OK;
	}
public:
	IPXS_Inst*			m_pxsInst = nullptr;
};

HRESULT OpenDocumentFromFileSample(LPCWSTR sFilePath, IPXC_Inst* pInst)
{
	if (pInst == nullptr)
		return E_INVALIDARG;
	//Getting IPXS_Inst if you don't have it
	IPXS_Inst* pSInst = nullptr;
	IUnknown* pUnk = nullptr;
	pInst->GetExtension(L"PXS", &pUnk);
	if (pUnk)
		pUnk->QueryInterface(&pSInst);
	if (pSInst == nullptr)
		return E_FAIL;

	HRESULT hr = S_OK;
	IPXC_Document* pDoc = nullptr;
	do
	{
		CComObject<CDocAuthCallbackImpl>* pCoObj;// Callback where the AuthDoc function should be implemented for authorization if some of your documents have password protection else - nullptr as default
		hr = CComObject<CDocAuthCallbackImpl>::CreateInstance(&pCoObj);
		if (hr != S_OK)
			break;
		pCoObj->AddRef();
		pCoObj->m_pxsInst = pSInst;
		//Opening document from file with given file name with default parameters
		hr = pInst->OpenDocumentFromFile(sFilePath, pCoObj, nullptr, 0, 0, &pDoc);
		pCoObj->Release();
		if (hr != S_OK)
			break;

		//Successfully opened doc
		//...
	} while (false);

	pSInst->Release();
	if (pDoc)
		pDoc->Release();

	return hr;
}