[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Owner](https://evolu.dev/docs/api-reference/common/local-first/Owner) › OwnerEncryptionKey

```ts
type OwnerEncryptionKey = Uint8Array<ArrayBufferLike> &
  import("../Brand.ts").Brand<"Entropy"> &
  import("../Brand.ts").Brand<"Length32"> &
  import("../Brand.ts").Brand<"EncryptionKey"> &
  import("../Brand.ts").Brand<"OwnerEncryptionKey">;
```

Defined in: [packages/common/src/local-first/Owner.ts:108](https://github.com/evoluhq/evolu/blob/49ea8ca499566aba270f8cb601e7f49aa62320f8/packages/common/src/local-first/Owner.ts#L108)

Symmetric encryption key for [Owner](https://evolu.dev/docs/api-reference/common/local-first/Owner/interfaces/Owner) data protection.