"Early last month, it became clear that Apple might be causing trouble for the W3C Widgets specification. They are unwilling to make patent 5,764,992 (W3C information), which covers automatic software upates, royalty-free if the Widgets Update specification is found to use anything covered by the patent. This basically means a lot of additional work for the Working Group at the W3C, and might slow down the process of finalizing the widgets specification."
Source: http://my.opera.com/haavard/blog/2009/04/07/apple-widgets-patent