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+.. _Signature:
+
+Signature Class
+===============
+
+A Signature is an abstract base class providing methods to work with the signature information in a Data packet. You must create an object of a subclass, for example Sha256WithRsaSignature.
+
+:[C++]:
+    Namespace: ``ndn``
+
+:[Python]:
+    Module: ``pyndn``
+
+Signature.clone Method
+----------------------
+
+Return a pointer to a new Signature which is a copy of this signature. This is abstract, the subclass must implement it.
+
+:[C++]:
+
+.. code-block:: c++
+
+    virtual ptr_lib::shared_ptr<Signature> clone() const = 0;
+
+:Returns:
+
+An now object of a subclass of Signature which is a clone of this object.
+
+Sha256WithRsaSignature Class
+============================
+
+A Sha256WithRsaSignature extends Signature and holds the signature bits and other info representing a SHA256-with-RSA signature in a data packet.
+
+:[C++]:
+    Namespace: ``ndn``
+
+:[Python]:
+    Module: ``pyndn``
+
+Sha256WithRsaSignature Constructor
+----------------------------------
+
+Create a new Sha256WithRsaSignature object.
+
+:[C++]:
+
+.. code-block:: c++
+
+    Sha256WithRsaSignature();
+
+Sha256WithRsaSignature.clone Method
+-----------------------------------
+
+Return a pointer to a new Sha256WithRsaSignature which is a copy of this signature.
+
+:[C++]:
+
+.. code-block:: c++
+
+    virtual ptr_lib::shared_ptr<Signature> clone() const;
+
+:Returns:
+
+    A new Sha256WithRsaSignature object.