diff --git a/fairmq/FairMQMessage.h b/fairmq/FairMQMessage.h
index 1341c0f9..a559720b 100644
--- a/fairmq/FairMQMessage.h
+++ b/fairmq/FairMQMessage.h
@@ -29,14 +29,15 @@ class FairMQMessage
     virtual void Rebuild(const size_t size) = 0;
     virtual void Rebuild(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) = 0;
 
-    virtual void* GetData() = 0;
+    virtual void* GetData() const = 0;
     virtual size_t GetSize() const = 0;
 
     virtual bool SetUsedSize(const size_t size) = 0;
 
     virtual FairMQ::Transport GetType() const = 0;
 
-    virtual void Copy(const std::unique_ptr<FairMQMessage>& msg) = 0;
+    virtual void Copy(const std::unique_ptr<FairMQMessage>& msg) __attribute__((deprecated("Use 'Copy(const FairMQMessage& msg)'"))) = 0;
+    virtual void Copy(const FairMQMessage& msg) = 0;
 
     virtual ~FairMQMessage() {};
 };
diff --git a/fairmq/devices/FairMQBenchmarkSampler.cxx b/fairmq/devices/FairMQBenchmarkSampler.cxx
index 729d4df2..14e80055 100644
--- a/fairmq/devices/FairMQBenchmarkSampler.cxx
+++ b/fairmq/devices/FairMQBenchmarkSampler.cxx
@@ -67,7 +67,7 @@ void FairMQBenchmarkSampler::Run()
         if (fSameMessage)
         {
             FairMQMessagePtr msg(dataOutChannel.Transport()->CreateMessage());
-            msg->Copy(baseMsg);
+            msg->Copy(*baseMsg);
 
             if (dataOutChannel.Send(msg) >= 0)
             {
diff --git a/fairmq/devices/FairMQMultiplier.cxx b/fairmq/devices/FairMQMultiplier.cxx
index 8311e7ab..c40fa289 100644
--- a/fairmq/devices/FairMQMultiplier.cxx
+++ b/fairmq/devices/FairMQMultiplier.cxx
@@ -49,7 +49,7 @@ bool FairMQMultiplier::HandleSingleData(std::unique_ptr<FairMQMessage>& payload,
         for (unsigned int j = 0; j < fChannels.at(fOutChannelNames.at(i)).size(); ++j) // all subChannels in a channel
         {
             FairMQMessagePtr msgCopy(fTransportFactory->CreateMessage());
-            msgCopy->Copy(payload);
+            msgCopy->Copy(*payload);
 
             Send(msgCopy, fOutChannelNames.at(i), j);
         }
@@ -60,7 +60,7 @@ bool FairMQMultiplier::HandleSingleData(std::unique_ptr<FairMQMessage>& payload,
     for (unsigned int i = 0; i < lastChannelSize - 1; ++i) // iterate over all except last subChannels of the last channel
     {
         FairMQMessagePtr msgCopy(fTransportFactory->CreateMessage());
-        msgCopy->Copy(payload);
+        msgCopy->Copy(*payload);
 
         Send(msgCopy, fOutChannelNames.back(), i);
     }
@@ -81,7 +81,7 @@ bool FairMQMultiplier::HandleMultipartData(FairMQParts& payload, int /*index*/)
             for (int k = 0; k < payload.Size(); ++k)
             {
                 FairMQMessagePtr msgCopy(fTransportFactory->CreateMessage());
-                msgCopy->Copy(payload.At(k));
+                msgCopy->Copy(payload.AtRef(k));
                 parts.AddPart(std::move(msgCopy));
             }
 
@@ -98,7 +98,7 @@ bool FairMQMultiplier::HandleMultipartData(FairMQParts& payload, int /*index*/)
         for (int k = 0; k < payload.Size(); ++k)
         {
             FairMQMessagePtr msgCopy(fTransportFactory->CreateMessage());
-            msgCopy->Copy(payload.At(k));
+            msgCopy->Copy(payload.AtRef(k));
             parts.AddPart(std::move(msgCopy));
         }
 
diff --git a/fairmq/nanomsg/FairMQMessageNN.cxx b/fairmq/nanomsg/FairMQMessageNN.cxx
index 77246ae4..c95e1ff3 100644
--- a/fairmq/nanomsg/FairMQMessageNN.cxx
+++ b/fairmq/nanomsg/FairMQMessageNN.cxx
@@ -131,12 +131,12 @@ void FairMQMessageNN::Rebuild(void* data, const size_t size, fairmq_free_fn* ffn
     }
 }
 
-void* FairMQMessageNN::GetMessage()
+void* FairMQMessageNN::GetMessage() const
 {
     return fMessage;
 }
 
-void* FairMQMessageNN::GetData()
+void* FairMQMessageNN::GetData() const
 {
     return fMessage;
 }
@@ -173,6 +173,30 @@ FairMQ::Transport FairMQMessageNN::GetType() const
     return fTransportType;
 }
 
+void FairMQMessageNN::Copy(const FairMQMessage& msg)
+{
+    if (fMessage)
+    {
+        if (nn_freemsg(fMessage) < 0)
+        {
+            LOG(ERROR) << "failed freeing message, reason: " << nn_strerror(errno);
+        }
+    }
+
+    size_t size = msg.GetSize();
+
+    fMessage = nn_allocmsg(size, 0);
+    if (!fMessage)
+    {
+        LOG(ERROR) << "failed allocating message, reason: " << nn_strerror(errno);
+    }
+    else
+    {
+        memcpy(fMessage, static_cast<const FairMQMessageNN&>(msg).GetMessage(), size);
+        fSize = size;
+    }
+}
+
 void FairMQMessageNN::Copy(const FairMQMessagePtr& msg)
 {
     if (fMessage)
diff --git a/fairmq/nanomsg/FairMQMessageNN.h b/fairmq/nanomsg/FairMQMessageNN.h
index 97737ae1..ca4e7042 100644
--- a/fairmq/nanomsg/FairMQMessageNN.h
+++ b/fairmq/nanomsg/FairMQMessageNN.h
@@ -41,13 +41,14 @@ class FairMQMessageNN : public FairMQMessage
     void Rebuild(const size_t size) override;
     void Rebuild(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) override;
 
-    void* GetData() override;
+    void* GetData() const override;
     size_t GetSize() const override;
 
     bool SetUsedSize(const size_t size) override;
 
     FairMQ::Transport GetType() const override;
 
+    void Copy(const FairMQMessage& msg) override;
     void Copy(const FairMQMessagePtr& msg) override;
 
     ~FairMQMessageNN() override;
@@ -59,7 +60,7 @@ class FairMQMessageNN : public FairMQMessage
     FairMQUnmanagedRegion* fRegionPtr;
     static FairMQ::Transport fTransportType;
 
-    void* GetMessage();
+    void* GetMessage() const;
     void CloseMessage();
     void SetMessage(void* data, const size_t size);
 };
diff --git a/fairmq/shmem/FairMQMessageSHM.cxx b/fairmq/shmem/FairMQMessageSHM.cxx
index c735588c..50d73ee5 100644
--- a/fairmq/shmem/FairMQMessageSHM.cxx
+++ b/fairmq/shmem/FairMQMessageSHM.cxx
@@ -202,7 +202,7 @@ zmq_msg_t* FairMQMessageSHM::GetMessage()
     return &fMessage;
 }
 
-void* FairMQMessageSHM::GetData()
+void* FairMQMessageSHM::GetData() const
 {
     if (fLocalPtr)
     {
@@ -274,7 +274,30 @@ FairMQ::Transport FairMQMessageSHM::GetType() const
     return fTransportType;
 }
 
-void FairMQMessageSHM::Copy(const unique_ptr<FairMQMessage>& msg)
+void FairMQMessageSHM::Copy(const FairMQMessage& msg)
+{
+    if (fHandle < 0)
+    {
+        bipc::managed_shared_memory::handle_t otherHandle = static_cast<const FairMQMessageSHM&>(msg).fHandle;
+        if (otherHandle)
+        {
+            if (InitializeChunk(msg.GetSize()))
+            {
+                memcpy(GetData(), msg.GetData(), msg.GetSize());
+            }
+        }
+        else
+        {
+            LOG(ERROR) << "FairMQMessageSHM::Copy() fail: source message not initialized!";
+        }
+    }
+    else
+    {
+        LOG(ERROR) << "FairMQMessageSHM::Copy() fail: target message already initialized!";
+    }
+}
+
+void FairMQMessageSHM::Copy(const FairMQMessagePtr& msg)
 {
     if (fHandle < 0)
     {
diff --git a/fairmq/shmem/FairMQMessageSHM.h b/fairmq/shmem/FairMQMessageSHM.h
index 3da6301e..c3e845af 100644
--- a/fairmq/shmem/FairMQMessageSHM.h
+++ b/fairmq/shmem/FairMQMessageSHM.h
@@ -39,13 +39,14 @@ class FairMQMessageSHM : public FairMQMessage
     void Rebuild(const size_t size) override;
     void Rebuild(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) override;
 
-    void* GetData() override;
+    void* GetData() const override;
     size_t GetSize() const override;
 
     bool SetUsedSize(const size_t size) override;
 
     FairMQ::Transport GetType() const override;
 
+    void Copy(const FairMQMessage& msg) override;
     void Copy(const FairMQMessagePtr& msg) override;
 
     ~FairMQMessageSHM() override;
@@ -58,10 +59,10 @@ class FairMQMessageSHM : public FairMQMessage
     static std::atomic<bool> fInterrupted;
     static FairMQ::Transport fTransportType;
     uint64_t fRegionId;
-    fair::mq::shmem::Region* fRegionPtr;
+    mutable fair::mq::shmem::Region* fRegionPtr;
     boost::interprocess::managed_shared_memory::handle_t fHandle;
     size_t fSize;
-    char* fLocalPtr;
+    mutable char* fLocalPtr;
 
     bool InitializeChunk(const size_t size);
     zmq_msg_t* GetMessage();
diff --git a/fairmq/test/message_resize/_message_resize.cxx b/fairmq/test/message_resize/_message_resize.cxx
index 91a05268..2a4bc0e8 100644
--- a/fairmq/test/message_resize/_message_resize.cxx
+++ b/fairmq/test/message_resize/_message_resize.cxx
@@ -45,7 +45,7 @@ auto RunPushPullWithMsgResize(string transport, string address) -> void {
     outMsg->SetUsedSize(250);
     ASSERT_EQ(outMsg->GetSize(), 250);
     FairMQMessagePtr msgCopy(push.NewMessage());
-    msgCopy->Copy(outMsg);
+    msgCopy->Copy(*outMsg);
     ASSERT_EQ(msgCopy->GetSize(), 250);
 
     ASSERT_EQ(push.Send(outMsg), 250);
diff --git a/fairmq/zeromq/FairMQMessageZMQ.cxx b/fairmq/zeromq/FairMQMessageZMQ.cxx
index 90bfa4f9..d008e7d0 100644
--- a/fairmq/zeromq/FairMQMessageZMQ.cxx
+++ b/fairmq/zeromq/FairMQMessageZMQ.cxx
@@ -112,7 +112,7 @@ void FairMQMessageZMQ::Rebuild(void* data, const size_t size, fairmq_free_fn* ff
     }
 }
 
-zmq_msg_t* FairMQMessageZMQ::GetMessage()
+zmq_msg_t* FairMQMessageZMQ::GetMessage() const
 {
     if (!fViewMsg)
     {
@@ -124,7 +124,7 @@ zmq_msg_t* FairMQMessageZMQ::GetMessage()
     }
 }
 
-void* FairMQMessageZMQ::GetData()
+void* FairMQMessageZMQ::GetData() const
 {
     if (!fViewMsg)
     {
@@ -195,6 +195,24 @@ FairMQ::Transport FairMQMessageZMQ::GetType() const
     return fTransportType;
 }
 
+void FairMQMessageZMQ::Copy(const FairMQMessage& msg)
+{
+    const FairMQMessageZMQ& zMsg = static_cast<const FairMQMessageZMQ&>(msg);
+    // Shares the message buffer between msg and this fMsg.
+    if (zmq_msg_copy(fMsg.get(), zMsg.GetMessage()) != 0)
+    {
+        LOG(ERROR) << "failed copying message, reason: " << zmq_strerror(errno);
+        return;
+    }
+
+    // if the target message has been resized, apply same to this message also
+    if (zMsg.fUsedSizeModified)
+    {
+        fUsedSizeModified = true;
+        fUsedSize = zMsg.fUsedSize;
+    }
+}
+
 void FairMQMessageZMQ::Copy(const FairMQMessagePtr& msg)
 {
     FairMQMessageZMQ* msgPtr = static_cast<FairMQMessageZMQ*>(msg.get());
diff --git a/fairmq/zeromq/FairMQMessageZMQ.h b/fairmq/zeromq/FairMQMessageZMQ.h
index 918a698b..0f6baf3e 100644
--- a/fairmq/zeromq/FairMQMessageZMQ.h
+++ b/fairmq/zeromq/FairMQMessageZMQ.h
@@ -40,7 +40,7 @@ class FairMQMessageZMQ : public FairMQMessage
     void Rebuild(const size_t size) override;
     void Rebuild(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) override;
 
-    void* GetData() override;
+    void* GetData() const override;
     size_t GetSize() const override;
 
     bool SetUsedSize(const size_t size) override;
@@ -49,6 +49,7 @@ class FairMQMessageZMQ : public FairMQMessage
     FairMQ::Transport GetType() const override;
 
     void Copy(const FairMQMessagePtr& msg) override;
+    void Copy(const FairMQMessage& msg) override;
 
     ~FairMQMessageZMQ() override;
 
@@ -59,7 +60,7 @@ class FairMQMessageZMQ : public FairMQMessage
     std::unique_ptr<zmq_msg_t> fViewMsg; // view on a subset of fMsg (treating it as user buffer)
     static FairMQ::Transport fTransportType;
 
-    zmq_msg_t* GetMessage();
+    zmq_msg_t* GetMessage() const;
     void CloseMessage();
 };