Key legal question
Whether the appeal met the admissibility requirements of Art. 84 LTF for international mutual assistance matters.
Extracted holding
The case was not particularly important within the meaning of Art. 84 LTF, so the appeal could not be heard on the merits.
Extracted reasoning
The appellant did not show any violation of elementary procedural principles or serious defects in the foreign proceedings; his objections on proportionality, double criminality, hearing rights, and usefulness of evidence did not raise a principle question or exceptional importance.