If you've been following BlackBerry news lately, you know that Kik Messenger was booted out of the Blackberry app store by RIM on Nov 12, for "breaching contractual obligations".
Kik is an in instant messaging service, much like RIM's BlackBerry Messenger (BBM). Just like BBM, Kik Messenger also has little indicators that shows when a message has been sent, delivered, read, and even when a user is typing a message. With 2.5 million users after only a month in existence, Kik certainly presents a credible threat to BBM if it continues to gain users at such a rapid pace.
It looks like RIM just upped the ante on Kik. On Nov 30, lawyers for Research in Motion filed a patent infringement lawsuit against Kik in Canada's Federal Court in Toronto, in court file T-1996-10. I haven't read the Statement of Claim outlining RIM's allegations against Kik yet, but I suspect that the patent at issue covers a messaging platform that provides sent, delivered, read, and typing indicators.
And if a Canadian suit has been filed, a US patent infringement suit can't be far behind. RIM is likely to have a US patent with claims similar in scope as the Canadian patent in T-1996-10.
Update: I took a look at the statement of claim, and it's not just patent infringement that's at issue.
Update 2: Kik has now filed their statement of defence and counterclaim.