What gets me about the patent system is that there seems to be no requirement for due diligence on the side of the patent holder. You'd think if BB cared about these technologies, they'd have sent a letter to the companies years ago before they amassed millions of users. They could have put out an ad saying that other companies are using patent protected tech and so you should use BB to make sure your service isn't disrupted. Or they could be making money now licensing the tech. For example, WhatsApp sold for billions. It'd have a very different value if they had to pay a per user license fee, which BB could have asked for years ago. I think a forgotten patent should be considered abandoned.