When specifying several EXT-X-KEY one after another(multi drm playlist), only the last EXT-X-KEY is assigned to the segments

[Able1991]

Sample:

#EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:4
#EXT-X-MAP:URI="init.mp4"
#EXT-X-KEY:METHOD=SAMPLE-AES,URI="skd://SOME_SKD",KEYFORMATVERSIONS="1",KEYFORMAT="com.apple.streamingkeydelivery"
#EXT-X-KEY:METHOD=SAMPLE-AES,URI="XXXXX"
#EXTINF:2.000,
127920.m4s

After parsing I see one key in the segment

[kuu]

Can you elaborate the multi-key use case?
Maybe you refer to the following sentence in the spec:

Two or more EXT-X-KEY tags with different KEYFORMAT attributes MAY apply to the same Media Segment if they ultimately produce the same decryption key.

But I still don't understand what's the point of having different keys for the same segment.

[Able1991]

Can you elaborate the multi-key use case? Maybe you refer to the following sentence in the spec:

Two or more EXT-X-KEY tags with different KEYFORMAT attributes MAY apply to the same Media Segment if they ultimately produce the same decryption key.

But I still don't understand what's the point of having different keys for the same segment.

I'm doing Widevine + Fairplay in HLS using shaka-packager with cbcs protection scheme

[kuu]

Can you attach the actual manifest?
I just wanted to see all attributes.
You can obscure the URLs.

[Able1991]

#EXTM3U
#EXT-X-VERSION:6
## Generated with https://github.com/google/shaka-packager version v2.6.1-634af65-release
#EXT-X-TARGETDURATION:3
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-MAP:URI="init.mp4"
#EXT-X-KEY:METHOD=SAMPLE-AES,URI="data:text/plain;base64,mgIAAAEAAQCQAjwAVwBSAE0ASABFAEEARABFAFIAIAB4AG0AbABuAHMAPQAiAGgAdAB0AHAAOgAvAC8AcwBjAGgAZQBtAGEAcwAuAG0AaQBjAHIAbwBzAG8AZgB0AC4AYwBvAG0ALwBEAFIATQAvADIAMAAwADcALwAwADMALwBQAGwAYQB5AFIAZQBhAGQAeQBIAGUAYQBkAGUAcgAiACAAdgBlAHIAcwBpAG8AbgA9ACIANAAuADAALgAwAC4AMAAiAD4APABEAEEAVABBAD4APABQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsARQBZAEwARQBOAD4AMQA2ADwALwBLAEUAWQBMAEUATgA+ADwAQQBMAEcASQBEAD4AQQBFAFMAQwBUAFIAPAAvAEEATABHAEkARAA+ADwALwBQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsASQBEAD4AUgB1AGYAVwBJAHEAQgA2ADIAMwB6AHUAdQA1AHEAWAAzAGsARgB6AGwAZwA9AD0APAAvAEsASQBEAD4APABDAEgARQBDAEsAUwBVAE0APgAwAGsAUQAxAGIAbwB0AEkAVwBkAGcAPQA8AC8AQwBIAEUAQwBLAFMAVQBNAD4APABMAEEAXwBVAFIATAA+AGgAdAB0AHAAcwA6AC8ALwBkAHIAbQAyADUANQA0ADIALgBtAC4AZAByAG0AbgBvAHcALgByAHUALwBwAGwAYQB5AHIAZQBhAGQAeQAvAHIAaQBnAGgAdABzAG0AYQBuAGEAZwBlAHIALgBhAHMAbQB4ADwALwBMAEEAXwBVAFIATAA+ADwALwBEAEEAVABBAD4APAAvAFcAUgBNAEgARQBBAEQARQBSAD4A",KEYFORMAT="com.microsoft.playready",KEYFORMATVERSIONS="1"
#EXT-X-KEY:METHOD=SAMPLE-AES,URI="skd://22d6e7467aa07cdbeebb9a97de417396",KEYFORMATVERSIONS="1",KEYFORMAT="com.apple.streamingkeydelivery"
#EXT-X-KEY:METHOD=SAMPLE-AES,URI="data:text/plain;base64,AAAAa3Bzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAAEsIARIgMjJkNmU3NDY3YWEwN2NkYmVlYmI5YTk3ZGU0MTczOTYaA2NkbiIgMjJkNmU3NDY3YWEwN2NkYmVlYmI5YTk3ZGU0MTczOTY=",KEYID=0x22D6E7467AA07CDBEEBB9A97DE417396,IV=0x0217FDB7ADADAB21D0D3539648AFA866,KEYFORMATVERSIONS="1",KEYFORMAT="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed"
#EXTINF:3.000,
1.m4s
#EXTINF:3.000,
2.m4s
#EXTINF:3.000,
3.m4s
#EXTINF:1.000,
4.m4s
#EXT-X-ENDLIST

[delight-by]

Multi-DRM is even more popular in 2025 than it was in 2023, highlighting a significant limitation of this library.