Hello Sebastian,
The disclaimer message is configured on server side.
Have a look in the SLAC at "Server configuration/Message Settings"
There you can edit the "CONFIG_ACTION_DISCLAIMER_MSG". Just clear the complete text field (of every language).
About NW SSO 2.0:
You use the 2.0 Client with a 1.0 Server (and also a 1.0 Client with a 2.0 Server).
A migration of a 1.0 Client to a 2.0 Client should be very easy (as every configuration on client side is compatible)
A migration of a 1.0 Server to a 2.0 Server, requires a complete reconfiguration of the Server.
You can find more information's about it here:
Migrating Secure Login Server 2.0 from 1.0
Here you can find informations about Secure Login 2.0:
SAP NetWeaver Single Sign-On Product Overview
Have a look at "What's New in Release 2.0?/Details"
Kind regards,
Jochen