Take a look at a lawyer’s opinion on the potential case of Internet Brands v. xenForo.
Fair Use Excerpt:
After having read the claims made by Internet Brands for myself, the best that I can conclude is that (a) many of the fiery opinions contained in the flurry of comments are misplaced and factually and legally incorrect, and (b) Internet Brands considers Xenforo, which hasn’t even been released yet, a serious potential player in the forum and community software market. There isn’t much information available as to the allegations in the lawsuit against Kier, Mike and Ashley, all former employees of Jelsoft – the original company that created the “beloved” vBulletin software. Many forum owners are outraged that Internet Brands (the subject of at least one controversy) would actually “stoop so low” so as to sue these good people who brought them the software that made their magic possible. From my perspective, it is impossible yet to tell whether Internet Brands has been wronged by well paid former employees and is vigorously attempting to rightfully protect its property or whether the lawsuit is a frivolous claim by a big corporation with deep pockets designed to unfairly thwart the efforts of a new competitor in the marketplace that leaves an especially bitter taste in its mouth.