diff --git a/README.md b/README.md
index 4cc460a..53462a8 100644
--- a/README.md
+++ b/README.md
@@ -10,4 +10,10 @@ Remote Desktop Protocol in Twisted Python
 * python-qt4
 * python-qt4reactor
 
+##Must be implemented before first release
+* CreedSSP
+* Packet redirection
+* License
+* Most common orders
+
 this project is still in progress.
diff --git a/rdpy/examples/rdpserver.py b/rdpy/examples/rdpserver.py
index 9125de5..2505223 100644
--- a/rdpy/examples/rdpserver.py
+++ b/rdpy/examples/rdpserver.py
@@ -7,9 +7,18 @@ import sys, os
 sys.path.insert(1, os.path.join(sys.path[0], '../..'))
 
 from rdpy.protocol.rdp import rdp
-from rdpy.network.layer import LayerMode
+
+class TestServerFactory(rdp.ServerFactory):
+    def startedConnecting(self, connector):
+        pass
+    
+    def clientConnectionLost(self, connector, reason):
+        pass
+        
+    def clientConnectionFailed(self, connector, reason):
+        pass
 
 if __name__ == '__main__':
     from twisted.internet import reactor
-    reactor.listenTCP(33389, rdp.Factory(LayerMode.SERVER))
+    reactor.listenTCP(33389, TestServerFactory())
     reactor.run()
\ No newline at end of file
diff --git a/rdpy/protocol/rdp/rdp.py b/rdpy/protocol/rdp/rdp.py
index 9e12bba..6ebf813 100644
--- a/rdpy/protocol/rdp/rdp.py
+++ b/rdpy/protocol/rdp/rdp.py
@@ -47,14 +47,41 @@ class ClientFactory(protocol.Factory):
         '''
         pduLayer = pdu.PDU(LayerMode.CLIENT)
         pduLayer.getController().addObserver(self.buildObserver())
-        return tpkt.TPKT(tpdu.TPDU(mcs.MCS(pduLayer)));
+        return tpkt.TPKT(tpdu.createClient(mcs.MCS(pduLayer)));
     
     def buildObserver(self):
         '''
         build observer use for connection
         '''
         pass
+
+class ServerFactory(protocol.Factory):
+    '''
+    Factory of Serrve RDP protocol
+    '''
+    def __init__(self, privateKeyFileName, certificateFileName):
+        '''
+        ctor
+        @param privateKeyFileName: file contain server private key
+        @param certficiateFileName: file that contain publi key
+        '''
+        self._privateKeyFileName = privateKeyFileName
+        self._certificateFileName = certificateFileName
         
+    def buildProtocol(self, addr):
+        '''
+        Function call from twisted and build rdp protocol stack
+        @param addr: destination address
+        '''
+        pduLayer = pdu.PDU(LayerMode.SERVER)
+        #pduLayer.getController().addObserver(self.buildObserver())
+        return tpkt.TPKT(tpdu.createServer(mcs.MCS(pduLayer), self._privateKeyFileName, self._certificateFileName));
+    
+    def buildObserver(self):
+        '''
+        build observer use for connection
+        '''
+        pass 
         
 class RDPClientObserver(object):
     '''
diff --git a/rdpy/protocol/rdp/tpdu.py b/rdpy/protocol/rdp/tpdu.py
index f02c3dd..f124fcd 100644
--- a/rdpy/protocol/rdp/tpdu.py
+++ b/rdpy/protocol/rdp/tpdu.py
@@ -1,6 +1,29 @@
-'''
-@author: sylvain
-'''
+#
+# Copyright (c) 2014 Sylvain Peyrefitte
+#
+# This file is part of rdpy.
+#
+# rdpy is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Implement transport pdu layer
+
+This layer have main goal to negociate ssl transport
+RDP basic security is not supported by RDPY (because is not a true security layer...)
+"""
+
 from rdpy.network.layer import LayerAutomata, LayerMode
 from rdpy.network.type import UInt8, UInt16Le, UInt16Be, UInt32Le, CompositeType, sizeof
 from rdpy.network.error import InvalidExpectedDataException
@@ -9,9 +32,9 @@ from rdpy.network.const import ConstAttributes, TypeAttributes
 @ConstAttributes
 @TypeAttributes(UInt8)
 class MessageType(object):
-    '''
+    """
     message type
-    '''
+    """
     X224_TPDU_CONNECTION_REQUEST = 0xE0
     X224_TPDU_CONNECTION_CONFIRM = 0xD0
     X224_TPDU_DISCONNECT_REQUEST = 0x80
@@ -21,9 +44,9 @@ class MessageType(object):
 @ConstAttributes
 @TypeAttributes(UInt8)
 class NegociationType(object):
-    '''
+    """
     negotiation header
-    '''
+    """
     TYPE_RDP_NEG_REQ = 0x01
     TYPE_RDP_NEG_RSP = 0x02
     TYPE_RDP_NEG_FAILURE = 0x03
@@ -31,9 +54,9 @@ class NegociationType(object):
 @ConstAttributes
 @TypeAttributes(UInt32Le)
 class Protocols(object):
-    '''
+    """
     protocols available for TPDU layer
-    '''
+    """
     PROTOCOL_RDP = 0x00000000
     PROTOCOL_SSL = 0x00000001
     PROTOCOL_HYBRID = 0x00000002
@@ -42,9 +65,9 @@ class Protocols(object):
 @ConstAttributes
 @TypeAttributes(UInt32Le)    
 class NegotiationFailureCode(object):
-    '''
+    """
     protocol negotiation failure code
-    '''
+    """
     SSL_REQUIRED_BY_SERVER = 0x00000001
     SSL_NOT_ALLOWED_BY_SERVER = 0x00000002
     SSL_CERT_NOT_ON_SERVER = 0x00000003
@@ -53,10 +76,13 @@ class NegotiationFailureCode(object):
     SSL_WITH_USER_AUTH_REQUIRED_BY_SERVER = 0x00000006
     
 class TPDUConnectMessage(CompositeType):
-    '''
+    """
     header of TPDU connection messages 
-    '''
+    """
     def __init__(self, code):
+        """
+        @param code: MessageType
+        """
         CompositeType.__init__(self)
         self.len = UInt8(lambda:sizeof(self) - 1)
         self.code = UInt8(code.value, constant = True)
@@ -65,9 +91,9 @@ class TPDUConnectMessage(CompositeType):
         self.protocolNeg = Negotiation(optional = True)
         
 class TPDUDataHeader(CompositeType):
-    '''
+    """
     header send when tpdu exchange application data
-    '''
+    """
     def __init__(self):
         CompositeType.__init__(self)
         self.header = UInt8(2, constant = True)
@@ -75,12 +101,12 @@ class TPDUDataHeader(CompositeType):
         self.separator = UInt8(0x80, constant = True)
     
 class Negotiation(CompositeType):
-    '''
-    negociation request message
+    """
+    negociate request message
     @see: request -> http://msdn.microsoft.com/en-us/library/cc240500.aspx
     @see: response -> http://msdn.microsoft.com/en-us/library/cc240506.aspx
     @see: failure ->http://msdn.microsoft.com/en-us/library/cc240507.aspx
-    '''
+    """
     def __init__(self, optional = False):
         CompositeType.__init__(self, optional = optional)
         self.code = UInt8()
@@ -91,42 +117,55 @@ class Negotiation(CompositeType):
         self.failureCode = UInt32Le(conditional = lambda: self.code == NegociationType.TYPE_RDP_NEG_FAILURE)
 
 class TPDU(LayerAutomata):
-    '''
+    """
     TPDU layer management
     there is an connection automata
-    '''
-    def __init__(self, presentation):
-        '''
-        Constructor
-        @param presentation: MCS layer
-        '''
-        LayerAutomata.__init__(self, presentation._mode, presentation)
+    """
+    def __init__(self, mode, presentation):
+        """
+        @param mode: automata mode (client or server)
+        @param presentation: upper layer, MCS layer in RDP case
+        """
+        LayerAutomata.__init__(self, mode, presentation)
         #default selectedProtocol is SSl because is the only supported
         #in this version of RDPY
         #client requested selectedProtocol
         self._requestedProtocol = Protocols.PROTOCOL_SSL
         #server selected selectedProtocol
         self._selectedProtocol = Protocols.PROTOCOL_SSL
+        
+        #Server mode informations for tls connexion
+        self._serverPrivateKeyFileName = None
+        self._serverCertificateFileName = None
+    
+    def initTLSServerInfos(self, privateKeyFileName, certificateFileName):
+        """
+        Init informations for ssl server connexion
+        @param privateKeyFileName: file contain server private key
+        @param certficiateFileName: file that contain publi key
+        """
+        self._serverPrivateKeyFileName = privateKeyFileName
+        self._serverCertificateFileName = certificateFileName
     
     def connect(self):
-        '''
+        """
         connection request
         for client send a connection request packet
-        '''
+        """
         if self._mode == LayerMode.CLIENT:
             self.sendConnectionRequest()
         else:
             self.setNextState(self.recvConnectionRequest)
     
     def recvConnectionConfirm(self, data):
-        '''
-        recv connection confirm message
+        """
+        receive connection confirm message
         next state is recvData 
         call connect on presentation layer if all is good
         @param data: Stream that contain connection confirm
         @see: response -> http://msdn.microsoft.com/en-us/library/cc240506.aspx
         @see: failure ->http://msdn.microsoft.com/en-us/library/cc240507.aspx
-        '''
+        """
         message = TPDUConnectMessage(MessageType.X224_TPDU_CONNECTION_CONFIRM)
         data.readType(message)
         
@@ -150,12 +189,12 @@ class TPDU(LayerAutomata):
         LayerAutomata.connect(self)
         
     def recvConnectionRequest(self, data):
-        '''
+        """
         read connection confirm packet
         next state is send connection confirm
-        @param data: stream
+        @param data: Stream
         @see : http://msdn.microsoft.com/en-us/library/cc240470.aspx
-        '''
+        """
         message = TPDUConnectMessage(MessageType.X224_TPDU_CONNECTION_REQUEST)
         data.readType(message)
         
@@ -177,21 +216,21 @@ class TPDU(LayerAutomata):
         self.sendConnectionConfirm()
     
     def recvData(self, data):
-        '''
+        """
         read data header from packet
         and pass to presentation layer
-        @param data: stream
-        '''
+        @param data: Stream
+        """
         header = TPDUDataHeader()
         data.readType(header)
         LayerAutomata.recv(self, data)
         
     def sendConnectionRequest(self):
-        '''
+        """
         write connection request message
         next state is recvConnectionConfirm
         @see: http://msdn.microsoft.com/en-us/library/cc240500.aspx
-        '''
+        """
         message = TPDUConnectMessage(MessageType.X224_TPDU_CONNECTION_REQUEST)
         message.protocolNeg.code = NegociationType.TYPE_RDP_NEG_REQ
         message.protocolNeg.selectedProtocol = self._requestedProtocol
@@ -199,36 +238,53 @@ class TPDU(LayerAutomata):
         self.setNextState(self.recvConnectionConfirm)
         
     def sendConnectionConfirm(self):
-        '''
+        """
         write connection confirm message
         next state is recvData
         @see : http://msdn.microsoft.com/en-us/library/cc240501.aspx
-        '''
+        """
         message = TPDUConnectMessage(MessageType.X224_TPDU_CONNECTION_CONFIRM)
         message.protocolNeg.code = NegociationType.TYPE_RDP_NEG_REQ
         message.protocolNeg.selectedProtocol = self._selectedProtocol
         self._transport.send(message)
         #_transport is TPKT and transport is TCP layer of twisted
-        self._transport.transport.startTLS(ServerTLSContext())
+        self._transport.transport.startTLS(ServerTLSContext(self._serverPrivateKeyFileName, self._serverCertificateFileName))
         #connection is done send to presentation
         LayerAutomata.connect(self)
         
     def send(self, message):
-        '''
+        """
         write message packet for TPDU layer
         add TPDU header
-        '''
+        @param message: network.Type message
+        """
         self._transport.send((TPDUDataHeader(), message))
         
+def createClient(presentation):
+    """
+    Factory of TPDU layer in Client mode
+    @param presentation: presentation layer, in RDP mode is MCS layer
+    """
+    return TPDU(LayerMode.CLIENT, presentation)
+
+def createServer(presentation, privateKeyFileName, certificateFileName):
+    """
+    Factory of TPDU layer in Server mode
+    @param privateKeyFileName: file contain server private key
+    @param certficiateFileName: file that contain publi key
+    """
+    tpdu = TPDU(LayerMode.SERVER, presentation)
+    tpdu.initTLSServerInfos(privateKeyFileName, certificateFileName)
+    return tpdu
 
 #open ssl needed
 from twisted.internet import ssl
 from OpenSSL import SSL
 
 class ClientTLSContext(ssl.ClientContextFactory):
-    '''
+    """
     client context factory for open ssl
-    '''
+    """
     def getContext(self):
         context = SSL.Context(SSL.TLSv1_METHOD)
         context.set_options(0x00020000)#SSL_OP_NO_COMPRESSION
@@ -237,9 +293,10 @@ class ClientTLSContext(ssl.ClientContextFactory):
         return context
     
 class ServerTLSContext(ssl.DefaultOpenSSLContextFactory):
-    '''
+    """
     server context factory for open ssl
-    '''
-    def __init__(self, *args, **kw):
-        kw['sslmethod'] = SSL.TLSv1_METHOD
-        ssl.DefaultOpenSSLContextFactory.__init__(self, *args, **kw)
\ No newline at end of file
+    @param privateKeyFileName: Name of a file containing a private key
+    @param certificateFileName: Name of a file containing a certificate
+    """
+    def __init__(self, privateKeyFileName, certificateFileName):
+        ssl.DefaultOpenSSLContextFactory.__init__(self, privateKeyFileName, certificateFileName, SSL.TLSv1_METHOD)
\ No newline at end of file
diff --git a/rdpy/protocol/rdp/tpkt.py b/rdpy/protocol/rdp/tpkt.py
index 32af92e..f1c4330 100644
--- a/rdpy/protocol/rdp/tpkt.py
+++ b/rdpy/protocol/rdp/tpkt.py
@@ -1,22 +1,44 @@
-'''
-@author: sylvain
-'''
+#
+# Copyright (c) 2014 Sylvain Peyrefitte
+#
+# This file is part of rdpy.
+#
+# rdpy is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Transport packet layer implementation
+
+Use to build correct size packet and handle slow path and fast path mode
+"""
 from rdpy.network.layer import RawLayer, LayerMode
 from rdpy.network.type import UInt8, UInt16Be, sizeof
 
 class TPKT(RawLayer):
-    '''
+    """
     TPKT layer in RDP protocol stack
     this layer only handle size of packet
     and determine if is a fast path packet
-    '''
+    """
     #first byte of classic tpkt header
     TPKT_PACKET = UInt8(3)
     
     def __init__(self, presentation):
-        '''
+        """
         Constructor
-        '''
+        @param presentation: presentation layer, in RDP case is TPDU layer
+        """
         RawLayer.__init__(self, LayerMode.NONE, presentation)
         #last packet version read from header
         self._lastPacketVersion = UInt8()
@@ -24,10 +46,10 @@ class TPKT(RawLayer):
         self._lastShortLength = UInt8()
         
     def connect(self):
-        '''
+        """
         call when transport layer connection
         is made (inherit from RawLayer)
-        '''
+        """
         #header is on two bytes
         self.expect(2, self.readHeader)
         #no connection automata on this layer
@@ -35,9 +57,10 @@ class TPKT(RawLayer):
             self._presentation.connect()
         
     def readHeader(self, data):
-        '''
+        """
         read header of TPKT packet
-        '''
+        @param data: Stream received from twisted layer
+        """
         #first read packet version
         data.readType(self._lastPacketVersion)
         #classic packet
@@ -57,18 +80,20 @@ class TPKT(RawLayer):
                 
         
     def readExtendedHeader(self, data):
-        '''
+        """
         header may be on 4 bytes
-        '''
+        @param data: Stream from twisted layer
+        """
         #next state is read data
         size = UInt16Be()
         data.readType(size)
         self.expect(size.value - 4, self.readData)
     
     def readExtendedFastPathHeader(self, data):
-        '''
-        fast ath header may be on 1 byte more
-        '''
+        """
+        fast path header may be on 1 byte more
+        @param data: Stream from twisted layer
+        """
         leftPart = UInt8()
         data.readType(leftPart)
         self._lastShortLength.value &= ~0x80
@@ -77,21 +102,24 @@ class TPKT(RawLayer):
         self.expect(self._lastShortLength.value - 3, self.readFastPath)
     
     def readFastPath(self, data):
-        '''
+        """
         fast path data
-        '''
+        @param data: Stream from twisted layer
+        """
         pass
     
     def readData(self, data):
-        '''
-        read classic TPKT packet
-        '''
+        """
+        read classic TPKT packet, last state in tpkt automata
+        @param data: Stream with correct size
+        """
         #next state is pass to 
         self._presentation.recv(data)
         self.expect(2, self.readHeader)
         
     def send(self, message):
-        '''
-        send encapsuled data
-        '''
+        """
+        send encompassed data
+        @param message: network.Type message to send
+        """
         RawLayer.send(self, (TPKT.TPKT_PACKET, UInt8(0), UInt16Be(sizeof(message) + 4), message))
\ No newline at end of file