waxwing on Nostr: With this whole Ledger recover saga: with what key are these "encrypted shards" ...

With this whole Ledger recover saga: with what key are these "encrypted shards" encrypted?

They're talking about a recovery scenario where you lost your bip39 seedphrase. You recover with 2 of the 3 SSS shards from these external companies. But they stress, everywhere, that the shards are encrypted. Encrypted with what key?