Before noting (at para. 110) that the OECD commentary on the wording of Art. 12 of the Model Convention supported a narrow view of the scope of immovable property in Art. 6, Lady Rose stated (at para. 109):
Article 12(4) [of the Canada-UK Treaty] defines "royalties" as any payment received "as a consideration for the use of, or the right to use, any copyright, patent, trade mark...". Para 8 of the Commentaries on Article 12 states that the Article includes both payments made under a licence and also payments made to compensate the owner for an infringement of the right. But it does not cover a payment that "whilst based on the number of times a right belonging to someone is used, are made to someone else who does not himself own the right or the right to use it". The Commentaries give as an example of the distinction being drawn a situation where an artist receives both a fee for performing and also, if the performance is recorded, a royalty for each sale of the recording. The performance fee would fall under Article 17 which deals with income of performers and athletes but royalties for each sale of the recording will fall within Article 12 where the artist is the holder of the copyright. But where the copyright in the sound recording belongs to a third party, the payments made under the contract fall under Articles 7 or 17 rather than under Article 12 even if the payments are contingent on the sale of the recordings. Further, the 2017 Commentaries make clear that where payments are made in exchange for an outright transfer of the rights, those payments do not fall within Article 12 because "the payment is not in consideration 'for the use of, or the right to use' that property and cannot therefore represent a royalty" (para 8.2). The payment will instead be a business profit within Article 7 or a capital gain within Article 13.