FYI: http://www.snellspace.com/wp/?p=610
"IBM just filed a blanket IPR disclosure relating to the activity of the Atompub WG... As of right now IBM has NO KNOWN patents or applications for patents that read on the Atom specs. However, as is well known, IBM has a massive IPR portfolio and it would take a very long time and cost a lot of money for us to dig through ‘em all to know for certain. Rather than spend the time and energy doing that, IBM has agreed to a blanket commitment to Royalty Free terms for any IPR that reads on the Standards Track specifications produced by the atompub Working Group." - James
