Sans-IO ClearKey ISO Common Encryption (ISO/IEC 23001-7). Callers supply keys; no DRM CDM.
Unprefixed reusable core — naming [ADR-0012](../../docs/adr/0012-unprefixed-reusable-cores.md).
Product policy: [ADR-0011](../../docs/adr/0011-clearkey-cenc.md) · [`docs/spec/iso_23001_7_cenc.md`](../../docs/spec/iso_23001_7_cenc.md).