“Single Sign On” IBM's Patent?

Recently I read IBM seeks $167m from Groupon in dispute over early internet patents[1], which also includes "single sign on" as patent. single sign on is being used by so many different websites, so in future all of them are in trouble?

[1] https://www.reuters.com/article/us-ibm-groupon-lawsuit/ibm-seeks-167-million-from-groupon-in-dispute-over-early-internet-patents-idUSKBN1K62VA