After each update I need to confirm license agreement (see LICENSE AGREEMENT
below). Is that really needed by some legal rule? It would be nice if I could
agree just once.

-----------------------------
LICENSE AGREEMENT.
In order to install 'Mesa-dri-nouveau', you must agree to terms of the
following license agreement:

WARNING: Nouveau DRI/3D driver selected.

This driver is considered experimental and is known to have issues with
applications that use certain 3D acceleration features of modern
NVIDIA hardware.

Symptoms include application crashes or lockups & crashes of your system's
graphical environment. Older Hardware and less demanding applications may work
just fine and do benefit from the Hardware acceleration features this driver
offers over software emulation.

Use of this driver is especially not recommended for use with the KDE Desktop
Environment or Qt-based Applications.

The hardware vendor potentially offers alternative drivers.

Please click "I Agree" if you accept the risks that may come with the
installation of this driver. Choose "I Disagree"  to prevent installation
of the driver and use software emulation instead.