Diffrence btw OPENSSH and SSH2

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Diffrence btw OPENSSH and SSH2
Item
Openssh(free at all)
SSH2(comercial version of ssh)
Generate key command
ssh-key
ssh-keygen2
Default directory of key file
~/.ssh
~/.ssh2
Authorization file location
~/.ssh/authorized_keys
~/.ssh2/authorization ; ~/.ssh2
Identity key file location
~/.ssh/
~/.ssh2/identification ; ~/.ssh2
Accept muti Authorization file
Yes
Yes
Pub-key conversion
ssh-keygen -e -f openssh-key.pub > ssh2-key.pub
ssh-keygen -i -f ssh2-key.pub > openssh-key.pub
Pub-key store format
Per line in ~/.ssh/authorized_keys
Different name under ~/.ssh2 and all name were included in ~/.ssh2/authorization with format "Key pubkey.pub"
Scp insight
Rcp over ssh
Sftp
Example
http://www.isi.edu/~weiye/howto/ssh2_openssh.html
SSH, The Secure Shell: The Definitive Guide

Explanation of SSH produces and protocols.
Terminology: SSH Protocols and Products
SSH
    A generic term referring to SSH protocols or software products.
SSH-1
    The SSH protocol, Version 1. This protocol went through several
    revisions, of which 1.3 and 1.5 are the best known, and we will
    write SSH-1.3 and SSH-1.5 should the distinction be necessary.
SSH-2
    The SSH protocol, Version 2, as defined by several draft standards
    documents of the IETF SECSH working group.
SSH1
    Tatu Ylönen's software implementing the SSH-1 protocol; the original
    SSH. Now distributed and maintained (minimally) by SSH
    Communications Security, Inc.
SSH2
    The "SSH Secure Shell" product from SSH Communications Security, Inc.
    This is a commercial SSH-2 protocol implementation, though it is
    licensed free of charge in some circumstances.
ssh (all lowercase letters)
    A client program included in SSH1, SSH2, OpenSSH, F-Secure SSH, and
    other products, for running secure terminal sessions and remote
    commands. In SSH1 and SSH2, it is also named ssh1/ssh2, respectively.
OpenSSH
    The product OpenSSH from the OpenBSD project,
    which implements both the SSH-1 and SSH-2 protocols.
OpenSSH/1
    OpenSSH, referring specifically to its behavior
    when using the SSH-1 protocol.
OpenSSH/2
    OpenSSH, referring specifically to its behavior
    when using the SSH-2 protocol.


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