A California appeals court on Tuesday upheld a trial judge's 2004 decision to toss out a lawsuit filed by the heirs of Stephen Slesinger, owners of the Winnie the Pooh rights, against the Walt Disney Co. because they had improperly searched Disney dumpsters looking for evidence and had thereby obtained thousands of pages of Disney documents, many of them marked privileged and confidential. Daniel Petrocelli, the attorney representing Disney in the lawsuit, had called the conduct of the Slesingers "an assault on the legal system." The heirs claim that Disney failed to pay royalties owed under a 1983 contract covering Pooh merchandise. A spokesman for the family said Tuesday that they would appeal the ruling to the California Supreme Court.