diff --git a/Minecraft.Client/ArchiveFile.cpp b/Minecraft.Client/ArchiveFile.cpp
index 786f89ae..608428b6 100644
--- a/Minecraft.Client/ArchiveFile.cpp
+++ b/Minecraft.Client/ArchiveFile.cpp
@@ -115,7 +115,7 @@ byteArray ArchiveFile::getFile(const wstring &filename)
 #if defined _XBOX_ONE || defined __ORBIS__ || defined _WINDOWS64
 		out = byteArray(data->filesize );
 
-		memcpy_s( out.data, out.length, m_cachedData + data->ptr, data->filesize );
+		memcpy( out.data, m_cachedData + data->ptr, data->filesize );
 #else
 
 #ifdef _UNICODE
diff --git a/Minecraft.Client/Camera.cpp b/Minecraft.Client/Camera.cpp
index 31652c22..4de96349 100644
--- a/Minecraft.Client/Camera.cpp
+++ b/Minecraft.Client/Camera.cpp
@@ -44,8 +44,8 @@ void Camera::prepare(shared_ptr<Player> player, bool mirror)
 	XMVECTOR _det;
 	XMFLOAT4 trans;
 
-	memcpy_s(&_modelview, sizeof(_modelview), modelview->_getDataPointer(), 64);
-	memcpy_s(&_proj, sizeof(_proj), projection->_getDataPointer(), 64);
+	memcpy( &_modelview, modelview->_getDataPointer(), 64 );
+	memcpy( &_proj, projection->_getDataPointer(), 64 );
 
 #if ( defined __ORBIS__ ) || ( defined __PSVITA__ )
 	_modelview = transpose(_modelview);
diff --git a/Minecraft.Client/Common/Consoles_App.cpp b/Minecraft.Client/Common/Consoles_App.cpp
index dcd74d7a..aad69227 100644
--- a/Minecraft.Client/Common/Consoles_App.cpp
+++ b/Minecraft.Client/Common/Consoles_App.cpp
@@ -795,7 +795,7 @@ static void Win64_LoadSettings(GAME_SETTINGS *gs)
     {
         GAME_SETTINGS temp = {};
         if (fread(&temp, sizeof(GAME_SETTINGS), 1, f) == 1)
-            memcpy_s(gs, sizeof(GAME_SETTINGS), &temp, sizeof(GAME_SETTINGS));
+            memcpy(gs, &temp, sizeof(GAME_SETTINGS));
         fclose(f);
     }
 }
@@ -7709,7 +7709,7 @@ void CMinecraftApp::SetSpecialTutorialCompletionFlag(int iPad, int index)
 
 void CMinecraftApp::SetUniqueMapName(char *pszUniqueMapName)
 {
-	memcpy_s(m_pszUniqueMapName, sizeof(m_pszUniqueMapName), pszUniqueMapName, 14);
+	memcpy(m_pszUniqueMapName,pszUniqueMapName,14);
 }
 
 char *CMinecraftApp::GetUniqueMapName(void)
@@ -7752,9 +7752,9 @@ void CMinecraftApp::AddLevelToBannedLevelList(int iPad, PlayerUID xuid, char *ps
 #ifdef _DURANGO
 	memcpy(&pBannedListData->wchPlayerUID, xuid.toString().c_str(), sizeof(WCHAR)*64);
 #else
-	memcpy_s(&pBannedListData->xuid, sizeof(PlayerUID), &xuid, sizeof(PlayerUID));
+	memcpy(&pBannedListData->xuid, &xuid, sizeof(PlayerUID));
 #endif
-	strcpy_s(pBannedListData->pszLevelName, sizeof(pBannedListData->pszLevelName), pszLevelName);
+	strcpy_s(pBannedListData->pszLevelName,pszLevelName);
 	m_vBannedListA[iPad]->push_back(pBannedListData);
 
     if (bWriteToTMS)
@@ -7764,7 +7764,7 @@ void CMinecraftApp::AddLevelToBannedLevelList(int iPad, PlayerUID xuid, char *ps
 		int iCount=0;
 		for (PBANNEDLISTDATA pData : *m_vBannedListA[iPad] )
 		{
-			memcpy_s(&pBannedList[iCount++], sizeof(BANNEDLISTDATA), pData, sizeof(BANNEDLISTDATA));
+			memcpy(&pBannedList[iCount++],pData,sizeof(BANNEDLISTDATA));
 		}
 
 		// 4J-PB - write to TMS++ now
@@ -7851,7 +7851,7 @@ void CMinecraftApp::RemoveLevelFromBannedLevelList(int iPad, PlayerUID xuid, cha
 		{
 			PBANNEDLISTDATA pBannedListData =m_vBannedListA[iPad]->at(i);
 
-			memcpy_s(&pBannedList[i], sizeof(BANNEDLISTDATA), pBannedListData, sizeof(BANNEDLISTDATA));
+			memcpy(&pBannedList[i],pBannedListData,sizeof(BANNEDLISTDATA));
 		}
 #ifdef _XBOX
 		StorageManager.WriteTMSFile(iPad,C4JStorage::eGlobalStorage_TitleUser,L"BannedList",(PBYTE)pBannedList, dwDataBytes);
@@ -8800,7 +8800,7 @@ unsigned int CMinecraftApp::AddTMSPPFileTypeRequest(eDLCContentType eType, bool
 								pTMSPPreq->lpCallbackParam=this;
 								pTMSPPreq->eStorageFacility=C4JStorage::eGlobalStorage_Title;
 								pTMSPPreq->eFileTypeVal=C4JStorage::TMS_FILETYPE_BINARY;
-								memcpy_s(pTMSPPreq->wchFilename, sizeof(pTMSPPreq->wchFilename), pDLC->wchDataFile, sizeof(WCHAR) * MAX_BANNERNAME_SIZE);
+								memcpy(pTMSPPreq->wchFilename,pDLC->wchDataFile,sizeof(WCHAR)*MAX_BANNERNAME_SIZE);
 								pTMSPPreq->eType=e_DLC_TexturePackData;
 								pTMSPPreq->eState=e_TMS_ContentState_Queued;
 								m_bAllTMSContentRetrieved=false;
@@ -8922,7 +8922,7 @@ unsigned int CMinecraftApp::AddTMSPPFileTypeRequest(eDLCContentType eType, bool
 							pTMSPPreq->eFileTypeVal=C4JStorage::TMS_FILETYPE_BINARY;
 							//wcstombs(pTMSPPreq->szFilename,pDLC->wchBanner,MAX_TMSFILENAME_SIZE);
 
-							memcpy_s(pTMSPPreq->wchFilename, sizeof(pTMSPPreq->wchFilename), pDLC->wchBanner, sizeof(WCHAR) * MAX_BANNERNAME_SIZE);
+							memcpy(pTMSPPreq->wchFilename,pDLC->wchBanner,sizeof(WCHAR)*MAX_BANNERNAME_SIZE);
 							pTMSPPreq->eType=eType;
 							pTMSPPreq->eState=e_TMS_ContentState_Queued;
 							m_bAllTMSContentRetrieved=false;
diff --git a/Minecraft.Client/Common/GameRules/ConsoleSchematicFile.cpp b/Minecraft.Client/Common/GameRules/ConsoleSchematicFile.cpp
index fec298e4..c261e0cd 100644
--- a/Minecraft.Client/Common/GameRules/ConsoleSchematicFile.cpp
+++ b/Minecraft.Client/Common/GameRules/ConsoleSchematicFile.cpp
@@ -653,7 +653,7 @@ void ConsoleSchematicFile::generateSchematicFile(DataOutputStream *dos, Level *l
 		break;
 	case Compression::eCompressionType_None:
 	default:
-		memcpy_s(ucTemp, inputSize, result.data, inputSize);
+		memcpy( ucTemp, result.data, inputSize );
 		break;
 	};
 
diff --git a/Minecraft.Client/Common/GameRules/GameRuleManager.cpp b/Minecraft.Client/Common/GameRules/GameRuleManager.cpp
index 96677388..63cbf628 100644
--- a/Minecraft.Client/Common/GameRules/GameRuleManager.cpp
+++ b/Minecraft.Client/Common/GameRules/GameRuleManager.cpp
@@ -422,7 +422,7 @@ bool GameRuleManager::readRuleFile(LevelGenerationOptions *lgo, BYTE *dIn, UINT
 		switch(compressionType)
 		{
 		case Compression::eCompressionType_None:
-			memcpy_s(decompressedBuffer.data, decompressedBuffer.length, compressedBuffer.data, uncompressedSize);
+			memcpy(decompressedBuffer.data, compressedBuffer.data, uncompressedSize);
 			break;
 
 		case Compression::eCompressionType_RLE:
diff --git a/Minecraft.Client/Common/Network/PlatformNetworkManagerStub.cpp b/Minecraft.Client/Common/Network/PlatformNetworkManagerStub.cpp
index 4e16e0f5..d2221a52 100644
--- a/Minecraft.Client/Common/Network/PlatformNetworkManagerStub.cpp
+++ b/Minecraft.Client/Common/Network/PlatformNetworkManagerStub.cpp
@@ -716,7 +716,7 @@ void CPlatformNetworkManagerStub::SystemFlagAddPlayer(INetworkPlayer *pNetworkPl
 	{
 		if( pNetworkPlayer->IsSameSystem(m_playerFlags[i]->m_pNetworkPlayer) )
 		{
-			memcpy_s(newPlayerFlags->flags, newPlayerFlags->count / 8, m_playerFlags[i]->flags, m_playerFlags[i]->count / 8);
+			memcpy( newPlayerFlags->flags, m_playerFlags[i]->flags, m_playerFlags[i]->count / 8 );
 			break;
 		}
 	}
diff --git a/Minecraft.Client/Common/UI/UIController.cpp b/Minecraft.Client/Common/UI/UIController.cpp
index 24b3aced..3183acb2 100644
--- a/Minecraft.Client/Common/UI/UIController.cpp
+++ b/Minecraft.Client/Common/UI/UIController.cpp
@@ -2977,7 +2977,7 @@ C4JStorage::EMessageResult UIController::RequestMessageBox(UINT uiTitle, UINT ui
 		QueuedMessageBoxData *queuedData = new QueuedMessageBoxData();
 		queuedData->info = param;
 		queuedData->info.uiOptionA = new UINT[param.uiOptionC];
-		memcpy_s(queuedData->info.uiOptionA, param.uiOptionC * sizeof(UINT), param.uiOptionA, param.uiOptionC * sizeof(UINT));
+		memcpy(queuedData->info.uiOptionA, param.uiOptionA, param.uiOptionC * sizeof(UINT));
 		queuedData->iPad = dwPad;
 		queuedData->layer = eUILayer_Error; // Ensures that these don't get wiped out by a CloseAllScenes call
 		m_queuedMessageBoxData.push_back(queuedData);
diff --git a/Minecraft.Client/Common/UI/UIScene_LeaderboardsMenu.cpp b/Minecraft.Client/Common/UI/UIScene_LeaderboardsMenu.cpp
index 5b52cb30..6d1c6499 100644
--- a/Minecraft.Client/Common/UI/UIScene_LeaderboardsMenu.cpp
+++ b/Minecraft.Client/Common/UI/UIScene_LeaderboardsMenu.cpp
@@ -736,7 +736,7 @@ void UIScene_LeaderboardsMenu::CopyLeaderboardEntry(LeaderboardManager::ReadScor
 	wstring wstr=convStringToWstring(statsRow->m_uid.getOnlineID());
 	swprintf(leaderboardEntry->m_gamerTag, XUSER_NAME_SIZE, L"%ls",wstr.c_str());
 #else
-	memcpy_s(leaderboardEntry->m_gamerTag, sizeof(leaderboardEntry->m_gamerTag), statsRow->m_name.data(), statsRow->m_name.size() * sizeof(wchar_t));
+	memcpy(leaderboardEntry->m_gamerTag, statsRow->m_name.data(), statsRow->m_name.size() * sizeof(wchar_t));
 #endif
 
 	// Copy the other columns
diff --git a/Minecraft.Client/Common/UI/UIScene_LoadCreateJoinMenu.cpp b/Minecraft.Client/Common/UI/UIScene_LoadCreateJoinMenu.cpp
index 2be4f1a2..79ee4ce5 100644
--- a/Minecraft.Client/Common/UI/UIScene_LoadCreateJoinMenu.cpp
+++ b/Minecraft.Client/Common/UI/UIScene_LoadCreateJoinMenu.cpp
@@ -155,7 +155,7 @@ int UIScene_LoadCreateJoinMenu::LoadSaveDataThumbnailReturned(LPVOID lpParam,PBY
     if(pbThumbnail && dwThumbnailBytes)
     {
         pClass->m_saveDetails[pClass->m_iRequestingThumbnailId].pbThumbnailData = new BYTE[dwThumbnailBytes];
-        memcpy_s(pClass->m_saveDetails[pClass->m_iRequestingThumbnailId].pbThumbnailData, dwThumbnailBytes, pbThumbnail, dwThumbnailBytes);
+        memcpy(pClass->m_saveDetails[pClass->m_iRequestingThumbnailId].pbThumbnailData, pbThumbnail, dwThumbnailBytes);
         pClass->m_saveDetails[pClass->m_iRequestingThumbnailId].dwThumbnailSize = dwThumbnailBytes;
     }
     else
@@ -773,10 +773,10 @@ void UIScene_LoadCreateJoinMenu::tick()
                         else
                         {
                             m_buttonListSaves.addItem(m_pSaveDetails->SaveInfoA[origIdx].UTF8SaveTitle, L"");
-                            memcpy_s(m_saveDetails[i].UTF8SaveName, sizeof(m_saveDetails[i].UTF8SaveName), m_pSaveDetails->SaveInfoA[origIdx].UTF8SaveTitle, 128);
+                            memcpy(m_saveDetails[i].UTF8SaveName, m_pSaveDetails->SaveInfoA[origIdx].UTF8SaveTitle, 128);
                         }
                         m_saveDetails[i].saveId = origIdx;
-                        memcpy_s(m_saveDetails[i].UTF8SaveFilename, sizeof(m_saveDetails[i].UTF8SaveFilename), m_pSaveDetails->SaveInfoA[origIdx].UTF8SaveFilename, MAX_SAVEFILENAME_LENGTH);
+                        memcpy(m_saveDetails[i].UTF8SaveFilename, m_pSaveDetails->SaveInfoA[origIdx].UTF8SaveFilename, MAX_SAVEFILENAME_LENGTH);
                     }
 #else
                     m_buttonListSaves.addItem(m_pSaveDetails->SaveInfoA[i].UTF8SaveTitle, L"");
diff --git a/Minecraft.Client/Extrax64Stubs.cpp b/Minecraft.Client/Extrax64Stubs.cpp
index fc6289d3..fa99e13a 100644
--- a/Minecraft.Client/Extrax64Stubs.cpp
+++ b/Minecraft.Client/Extrax64Stubs.cpp
@@ -433,7 +433,7 @@ HRESULT XMemDecompress(
 	SIZE_T SrcSize
 )
 {
-	memcpy_s(pDestination, *pDestSize, pSource, SrcSize);
+	memcpy(pDestination, pSource, SrcSize);
 	*pDestSize = SrcSize;
 	return S_OK;
 
@@ -464,7 +464,7 @@ HRESULT XMemCompress(
 	SIZE_T SrcSize
 )
 {
-	memcpy_s(pDestination, *pDestSize, pSource, SrcSize);
+	memcpy(pDestination, pSource, SrcSize);
 	*pDestSize = SrcSize;
 	return S_OK;
 
diff --git a/Minecraft.Client/Texture.cpp b/Minecraft.Client/Texture.cpp
index e5315cde..389dac3d 100644
--- a/Minecraft.Client/Texture.cpp
+++ b/Minecraft.Client/Texture.cpp
@@ -632,7 +632,7 @@ void Texture::transferFromImage(BufferedImage *image)
 
 			if( image->getData( level ) )
 			{
-				memcpy_s( tempData, ww * hh * 4, image->getData( level ), ww * hh * 4);
+				memcpy( tempData, image->getData( level ), ww * hh * 4);
 				for (int y = 0; y < hh; y++)
 				{
 					for (int x = 0; x < ww; x++)
diff --git a/Minecraft.Client/Textures.cpp b/Minecraft.Client/Textures.cpp
index afc485f9..691ca1c6 100644
--- a/Minecraft.Client/Textures.cpp
+++ b/Minecraft.Client/Textures.cpp
@@ -473,7 +473,7 @@ void Textures::bindTextureLayers(ResourceLocation *resource)
 				mergedWidth = width;
 				mergedHeight = height;
 				mergedPixels = intArray(width * height);
-				memcpy_s(mergedPixels.data, width * height * sizeof(int), layerPixels.data, width * height * sizeof(int));
+				memcpy(mergedPixels.data, layerPixels.data, width * height * sizeof(int));
 				hasMergedPixels = true;
 			}
 			else if( width == mergedWidth && height == mergedHeight )
@@ -514,7 +514,7 @@ void Textures::bindTextureLayers(ResourceLocation *resource)
 		if( hasMergedPixels )
 		{
 			BufferedImage *mergedImage = new BufferedImage(mergedWidth, mergedHeight, BufferedImage::TYPE_INT_ARGB);
-			memcpy_s(mergedImage->getData(), mergedWidth * mergedHeight * sizeof(int), mergedPixels.data, mergedWidth * mergedHeight * sizeof(int));
+			memcpy(mergedImage->getData(), mergedPixels.data, mergedWidth * mergedHeight * sizeof(int));
 			delete[] mergedPixels.data;
 			id = getTexture(mergedImage, C4JRender::TEXTURE_FORMAT_RxGyBzAw, false);
 		}
@@ -776,7 +776,7 @@ void Textures::loadTexture(BufferedImage *img, int id, bool blur, bool clamp)
 			// 4J - added - have we loaded mipmap data for this level? Use that rather than generating if possible
 			if( img->getData( level ) )
 			{
-				memcpy_s( tempData, ww * hh * 4, img->getData( level ), ww * hh * 4);
+				memcpy( tempData, img->getData( level ), ww * hh * 4);
 #ifndef _XBOX
 				// Swap ARGB to RGBA
 				for( int i = 0; i < ww * hh ; i++ )
diff --git a/Minecraft.Client/Windows64/KeyboardMouseInput.cpp b/Minecraft.Client/Windows64/KeyboardMouseInput.cpp
index 49eadbce..be6efe90 100644
--- a/Minecraft.Client/Windows64/KeyboardMouseInput.cpp
+++ b/Minecraft.Client/Windows64/KeyboardMouseInput.cpp
@@ -90,16 +90,16 @@ void KeyboardMouseInput::ClearAllState()
 
 void KeyboardMouseInput::Tick()
 {
-    memcpy_s(m_keyDownPrev, sizeof(m_keyDownPrev), m_keyDown, sizeof(m_keyDown));
-    memcpy_s(m_mouseButtonDownPrev, sizeof(m_mouseButtonDownPrev), m_mouseButtonDown, sizeof(m_mouseButtonDown));
+	memcpy(m_keyDownPrev, m_keyDown, sizeof(m_keyDown));
+	memcpy(m_mouseButtonDownPrev, m_mouseButtonDown, sizeof(m_mouseButtonDown));
 
-	memcpy_s(m_keyPressed, sizeof(m_keyPressed), m_keyPressedAccum, sizeof(m_keyPressedAccum));
-    memcpy_s(m_keyReleased, sizeof(m_keyReleased), m_keyReleasedAccum, sizeof(m_keyReleasedAccum));
+	memcpy(m_keyPressed, m_keyPressedAccum, sizeof(m_keyPressedAccum));
+	memcpy(m_keyReleased, m_keyReleasedAccum, sizeof(m_keyReleasedAccum));
 	memset(m_keyPressedAccum, 0, sizeof(m_keyPressedAccum));
 	memset(m_keyReleasedAccum, 0, sizeof(m_keyReleasedAccum));
 
-	memcpy_s(m_mouseBtnPressed, sizeof(m_mouseBtnPressed), m_mouseBtnPressedAccum, sizeof(m_mouseBtnPressedAccum));
-    memcpy_s(m_mouseBtnReleased, sizeof(m_mouseBtnReleased), m_mouseBtnReleasedAccum, sizeof(m_mouseBtnReleasedAccum));
+	memcpy(m_mouseBtnPressed, m_mouseBtnPressedAccum, sizeof(m_mouseBtnPressedAccum));
+	memcpy(m_mouseBtnReleased, m_mouseBtnReleasedAccum, sizeof(m_mouseBtnReleasedAccum));
 	memset(m_mouseBtnPressedAccum, 0, sizeof(m_mouseBtnPressedAccum));
 	memset(m_mouseBtnReleasedAccum, 0, sizeof(m_mouseBtnReleasedAccum));
 
diff --git a/Minecraft.Client/glWrapper.cpp b/Minecraft.Client/glWrapper.cpp
index 17d4d56c..d13e1a69 100644
--- a/Minecraft.Client/glWrapper.cpp
+++ b/Minecraft.Client/glWrapper.cpp
@@ -68,7 +68,7 @@ void glScaled(double x,double y,double z)
 
 void glGetFloat(int type, FloatBuffer *buff)
 {
-	memcpy_s(buff->_getDataPointer(), 64, RenderManager.MatrixGet(type), 64);
+	memcpy(buff->_getDataPointer(),RenderManager.MatrixGet(type),64);
 }
 
 void glDeleteLists(int first,int count)