http://www.thinq.co.uk/news/2010/4/22/s ... ut-asking/
The point is that Sony forces users to sign an agreement which allows you to use a piece of hardware which you have paid for, but allows Sony to make any changes they see fit to the way the console operates without notification or permission.
As far as we can tell, Sony has never exercised its self-appointed right to secretly alter the functionality of its hardware by subterfuge, but who would know?