unless and until an adjusted administrative assessment is established pursuant to an adjustment proceeding under clause (iii). (iv) Adjustment of administrative assessment The administrative assessment may be adjusted by the Copyright Royalty Judges periodically, in accordance with the following procedures: (I) No earlier than 1 year after the most recent publication of a determination of the administrative assessment by the Copyright Royalty Judges, the mechanical licensing collective, the digital licensee coordinator, or one or more interested copyright owners, digital music providers, or significant nonblanket licensees, may file a petition with the Copyright Royalty Judges in the month of October to commence a proceeding to adjust the administrative assessment. (II) Notice of the commencement of such proceeding shall be published in the Federal Register in the month of November following the filing of any petition, with a schedule of requested information and additional proceedings, as described in clause (iii)(III). The mechanical licensing collective and digital licensee coordinator shall participate in such proceeding, along with any interested copyright owners, digital music providers, or significant nonblanket licensees that have notified the Copyright Royalty Judges of their desire to participate. (III) The determination of the adjusted administrative assessment, which shall be supported by a written record, shall be published in the Federal Register during November of the calendar year following the commencement of the proceeding. The adjusted administrative assessment shall take effect January 1 of the year following such publication. (v) Adoption of voluntary agreements In lieu of reaching their own determination based on evaluation of relevant data, the Copyright Royalty Judges shall approve and adopt a negotiated agreement to establish the amount and terms of the administrative assessment that has been agreed to by the mechanical licensing collective and the digital licensee coordinator (or if