diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1526a32..e024872 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,7 +38,7 @@ target_compile_options(${PROJECT_NAME} PUBLIC
 )
 
 target_compile_definitions(${PROJECT_NAME} PUBLIC
-  $<$<CXX_COMPILER_ID:MSVC>:WIN32_LEAN_AND_MEAN;UNICODE>
+  $<$<CXX_COMPILER_ID:MSVC>:WIN32_LEAN_AND_MEAN;UNICODE;_CRT_SECURE_NO_WARNINGS>
 )
 
 target_link_libraries(${PROJECT_NAME} PRIVATE
diff --git a/include/pcsc-cpp/pcsc-cpp.hpp b/include/pcsc-cpp/pcsc-cpp.hpp
index 33ac0b6..5c934b6 100644
--- a/include/pcsc-cpp/pcsc-cpp.hpp
+++ b/include/pcsc-cpp/pcsc-cpp.hpp
@@ -62,8 +62,8 @@ struct ResponseApdu
         WRONG_LE_LENGTH = 0x6c
     };
 
-    byte_vector::value_type sw1;
-    byte_vector::value_type sw2;
+    byte_vector::value_type sw1 {};
+    byte_vector::value_type sw2 {};
 
     byte_vector data;
 
@@ -148,9 +148,8 @@ struct CommandApdu
             if (useLe) {
                 return CommandApdu {bytes[0], bytes[1],      bytes[2],
                                     bytes[3], byte_vector(), bytes[4]};
-            } else {
-                throw std::invalid_argument("Command APDU size 5 is invalid without LE");
             }
+            throw std::invalid_argument("Command APDU size 5 is invalid without LE");
         }
 
         if (bytes.size() == 6 && useLe) {
@@ -168,10 +167,9 @@ struct CommandApdu
                                 bytes[3],
                                 byte_vector(dataStart, bytes.cend() - 1),
                                 *(bytes.cend() - 1)};
-        } else {
-            return CommandApdu {bytes[0], bytes[1], bytes[2], bytes[3],
-                                byte_vector(dataStart, bytes.cend())};
         }
+        return CommandApdu {bytes[0], bytes[1], bytes[2], bytes[3],
+                            byte_vector(dataStart, bytes.cend())};
     }
 
     byte_vector toBytes() const
@@ -230,7 +228,7 @@ class SmartCard
         bool& inProgress;
     };
 
-    SmartCard(const ContextPtr& context, const string_t& readerName, const byte_vector& atr);
+    SmartCard(const ContextPtr& context, const string_t& readerName, byte_vector atr);
     ~SmartCard();
 
     // The rule of five.
diff --git a/src/SmartCard.cpp b/src/SmartCard.cpp
index 5d62d7d..b2a0db5 100644
--- a/src/SmartCard.cpp
+++ b/src/SmartCard.cpp
@@ -31,6 +31,7 @@
 #include <arpa/inet.h>
 #endif
 
+#include <array>
 #include <map>
 #include <utility>
 
@@ -81,10 +82,10 @@ class CardImpl
         // TODO: debug("Protocol: " + to_string(protocol()));
         try {
             DWORD size = 0;
-            BYTE feature[256];
-            SCard(Control, cardHandle, DWORD(CM_IOCTL_GET_FEATURE_REQUEST), nullptr, 0u, feature,
-                  DWORD(sizeof(feature)), &size);
-            for (unsigned char* p = feature; DWORD(p - feature) < size;) {
+            std::array<BYTE, 256> feature {};
+            SCard(Control, cardHandle, DWORD(CM_IOCTL_GET_FEATURE_REQUEST), nullptr, 0U,
+                  feature.data(), DWORD(feature.size()), &size);
+            for (auto p = feature.cbegin(); DWORD(std::distance(feature.cbegin(), p)) < size;) {
                 unsigned int tag = *p++;
                 unsigned int len = *p++;
                 unsigned int value = 0;
@@ -108,8 +109,16 @@ class CardImpl
         }
     }
 
+    // The rule of five (C++ Core guidelines C.21).
+    CardImpl(const CardImpl& other) = delete;
+    CardImpl(CardImpl&& other) noexcept = delete;
+    CardImpl& operator=(const CardImpl& other) = delete;
+    CardImpl& operator=(CardImpl&& other) noexcept = delete;
+
     bool readerHasPinPad() const
     {
+        if (getenv("SMARTCARDPP_NOPINPAD"))
+            return false;
         return features.find(FEATURE_VERIFY_PIN_START) != features.cend()
             || features.find(FEATURE_VERIFY_PIN_DIRECT) != features.cend();
     }
@@ -169,7 +178,7 @@ class CardImpl
         if (features.find(FEATURE_VERIFY_PIN_FINISH) != features.cend()) {
             DWORD finish = features.at(FEATURE_VERIFY_PIN_FINISH);
             responseLength = DWORD(responseBytes.size());
-            SCard(Control, cardHandle, finish, nullptr, 0u, LPVOID(responseBytes.data()),
+            SCard(Control, cardHandle, finish, nullptr, 0U, LPVOID(responseBytes.data()),
                   DWORD(responseBytes.size()), &responseLength);
         }
 
@@ -257,9 +266,9 @@ SmartCard::TransactionGuard::~TransactionGuard()
     }
 }
 
-SmartCard::SmartCard(const ContextPtr& contex, const string_t& readerName, const byte_vector& atr) :
+SmartCard::SmartCard(const ContextPtr& contex, const string_t& readerName, byte_vector atr) :
     card(std::make_unique<CardImpl>(connectToCard(contex->handle(), readerName))),
-    _protocol(convertToSmartCardProtocol(card->protocol())), _atr(atr)
+    _protocol(convertToSmartCardProtocol(card->protocol())), _atr(std::move(atr))
 {
     // TODO: debug("Card ATR -> " + bytes2hexstr(atr));
 }