Apparently, according to the iOS app developer, he "owns the trademark for the word “ToDo”"
As if the patent trolls haven't given us enough headaches, now we have trademark trolls
Link to Original Source
"And do you think (fop that I am) that I could be the Scarlet Pumpernickel?" -- Looney Tunes, The Scarlet Pumpernickel (1950, Chuck Jones)