Can't run or rip DVD?

[NERV]

I have a sony DDU 1621 and I can only run region 1 dvd's because I ran out of changes but I can't rip the dvd because it has some kind of lock and I had to start the dvd and just minimise it and it would work now I can't even do that all I want to do is be able to rip region 4 DVD's agion can anyone please help me?