(19)

(11)

EP 4 278 583 A1

(12)

(43) Date of publication: 22.11.2023 Bulletin 2023/47 (21) Application number: 21836687.0 (22) Date of filing: 03.12.2021

(51) International Patent Classification (IPC):  H04L 45/00(2022.01) H04L 49/00(2022.01) H04L 45/74(2022.01) (52) Cooperative Patent Classification (CPC): H04L 45/74; H04L 49/3009; H04L 45/54 (86) International application number: PCT/US2021/061702 (87) International publication number: WO 2022/154898 (21.07.2022 Gazette 2022/29)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 15.01.2021 GB 202100573 11.02.2021 US 202117174325 (71) Applicant: Microsoft Technology Licensing, LLC Redmond, WA 98052-6399 (US)	(72) Inventor: TREGENZA DANCER, Colin Redmond, Washington 98052-6399 (US) (74) Representative: CMS Cameron McKenna Nabarro Olswang LLP  Cannon Place 78 Cannon Street London EC4N 6AF London EC4N 6AF (GB)