Apple filed a stealth lawsuit last summer alleging that the Motorola Xoom violated the design patent that underpins the iPad. While Apple had some success leveling its big patent gun against Samsung, the same can't be said for Motorola: a German court just declared that the reference Android tablet doesn't infringe on Apple's design claim. The ruling isn't a complete win for Motorola, however, as the court wouldn't invalidate the patent -- it could theoretically be leveled against