Yes, and most of the times I like it!
Andreas,
Don't try to explain becuase it won't work. An old Professor of mine once said, " If you want to find two words which, put together, will guarantee total indifference on behalf of the public at large, those words are 'intellectual' and 'property'"
I fear that such mysteries such as 'inventive step' remain a closed book!

Best wishes
G