Comment 6 for bug 1938531

verified linux-oem-5.14 version 5.14.0-1021-oem from focal-proposed. v4l2loopback prebuilt and signed:

filename: /lib/modules/5.14.0-1021-oem/kernel/v4l2loopback/v4l2loopback.ko
license: GPL
author: Vasily Levin, IOhannes m zmoelnig <email address hidden>,Stefan Diewald,Anton Novikovet al.
description: V4L2 loopback video device
srcversion: 594E0DE21110E9D51B89C6B
depends: videodev
retpoline: Y
name: v4l2loopback
vermagic: 5.14.0-1021-oem SMP mod_unload modversions
sig_id: PKCS#7
signer: Build time autogenerated kernel key
sig_key: 6C:35:3A:49:55:DE:E5:56:21:AF:39:94:1F:E9:02:C3:2E:29:81:39
sig_hashalgo: sha512
signature: B9:3B:A0:FD:54:81:5A:F6:76:B2:C0:52:FE:C4:B0:7D:3D:8F:D7:BC:
...