81.3

(a) When voting by correspondence is chosen, the proposal shall be included in a written communication from the Director General to the Contracting States, inviting them to express their vote in writing.
(b) The invitation shall fix the time limit within which the reply containing the vote expressed in writing must reach the International Bureau. That time limit shall not be less than 3 months from the date of the invitation.
(c) Replies must be either positive or negative. Proposals for amendments or mere observations shall not be regarded as votes.
(d) The proposal shall be considered adopted if none of the Contracting States opposes the amendment and if at least one-half of the Contracting States express either approval or indifference or abstention.