Naja GPL kommt meist ohne Lizenzzahlung aus ;-)
mich würde interessieren was die proprietären Installscripts machen!
Auszug aus Lizenzabschnitt:

opsi is open source

The source code of opsi is licensed under GPLv2

The source code of opsi is property of the uib gmbh

Not open source are the opsi installation scripts (which are part of the debian or suse packages).

opsi and the opsi logo are registered trade marks of the uib gmbh