Key legal question
Whether the appellants had standing to challenge the transmission of the witness transcript and seized documents.
Extracted holding
They lacked standing because only the directly affected witness or the holder of a protected account/subject of coercive measures may generally appeal; the appellants were third parties.
Extracted reasoning
The court applied the settled standing rules in mutual assistance. The appellants were neither directly subjected to the coercive measures nor within the narrow exception for account-related transcript transmission.