Netflix added the ability to download movies and TV episodes for offline viewing in November last year. Music streaming service SoundCloud, and video hosting service Vimeo have had this feature for quite some time, too. But they are all being sued now by a patent troll. From an ArsTechnica report: The plaintiff is a company few have heard of: Blackbird Technologies, a company with no products or assets other than patents. Blackbird's business is to buy up patent rights and file lawsuits over them, a business known colloquially as "patent trolling." Last week, Blackbird (who tells potential clients about being "able to litigate at reduced costs and achieve results") filed lawsuits against Netflix, SoundCloud, Vimeo, Starz, Mubi, and Studio 3 Partners, which owns the Epix TV channel. [...] The patent-holding company, which filed the lawsuits in Delaware federal court, has good reason to hope for success. The '362 patent already has a track record of squeezing settlement cash out of big companies.