# Does ClearKey JS decryption support cbcs (AES-CBC pattern encryption), or only cenc (AES-CTR)?

**URL:** <https://community.bitmovin.com/t/does-clearkey-js-decryption-support-cbcs-aes-cbc-pattern-encryption-or-only-cenc-aes-ctr/3868>\
**Category:** Discussion\
**Tags:** bitmovin-player, bitmovin\
**Created:** [March 20, 2026, 8:40am UTC](https://community.bitmovin.com/t/does-clearkey-js-decryption-support-cbcs-aes-cbc-pattern-encryption-or-only-cenc-aes-ctr/3868 "2026-03-20T08:40:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![andy.yu\_7](https://avatars.discourse-cdn.com/v4/letter/a/87869e/32.png) [@andy.yu\_7](https://community.bitmovin.com/u/andy.yu_7)\
**Post date:** [March 20, 2026, 8:40am UTC](https://community.bitmovin.com/t/does-clearkey-js-decryption-support-cbcs-aes-cbc-pattern-encryption-or-only-cenc-aes-ctr/3868/1 "2026-03-20T08:40:01Z")

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「Does ClearKey JS decryption support cbcs (AES-CBC pattern encryption), or only cenc (AES-CTR)?