Holding that "[t]hose who seek to maintain the secrecy of documents attached to dispositive motions must meet the high threshold of showing that compelling reasons support secrecy"
Holding that the party or intervenor “seeking protection bears the burden of showing specific prejudice or harm will result if no protective order is granted”
Holding that, because the district court's order "conclusively determined the question of waiver" of the attorney-client privilege, appellant "must pursue its claim of attorney-client privilege at this time in order to ensure that its claim not later become moot by reason of the documents' disclosure to third parties"