HLS fmp4 using CENC(CTR) with Playready DRM

[kamalonly]

Does Shaka packager support packaging hls fmp4 using CENC(CTR) with Playready DRM?

[kqyang]

Not right now. I don't think there will be a lot of work to add support for it in Shaka packager, but we'll need to have a defined format first.

I am not aware of any public specification on carriage and signaling of Playready DRM in HLS playlist. Let us know if there is one.

[tinskip]

Pretty certain MS is defining their own HLS extensions, or at least planning to. Would make sense to coordinate.

…

On Wed, Nov 1, 2017 at 11:36 AM, Kongqun Yang ***@***.***> wrote: Not right now. I don't think there will be a lot of work to add support for it in Shaka packager, but we'll need to have a defined format first. I am not aware of any public specification on carriage and signaling of Playready DRM in HLS manifest. Let us know if there is one. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#283 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AG7evdqGPNIg3udqWBborP0Clk5r2Tltks5syLo5gaJpZM4QOAQp> .

-- Thomás Inskip | Software Engineer | tinskip@google.com | +1 650 241 9697

[universalarchi]

I don't know detail about DRM's specification. So I have a question.
I just wonder is this follow the standard of hls? same as supporting SAMPLE-AES-CENC widevine in m3u8+fmp4.
I think we don't need to follow hls standard. right? It is just for Apple's device. right?
ps. I don't want to make argument. I just wonder about drms in fmp4+m3u8.

[kqyang]

No, HLS standard does not define anything on non-Apple DRM systems. A custom tag needs to be defined, similar to Widevine's SAMPLE-AES-CENC, possibly extend from SAMPLE-AES-CENC. The specification should be made public and implemented in various players as well.

[kqyang]

Calls for contributions if you knows about Playready DRM signaling in HLS or if you have a copy of the specification. PR is always welcomed!

[modernletter]

According to current Microsoft documentation com.microsoft.playready is recommended KEYFORMAT used to signal PlayReady in HLS (fMP4) using standard #EXT-X-KEY tag. URI contains base-64 encoded PlayreadyObject, and METHOD is SAMPLE-AES (cbcs) / SAMPLE-AES-CRT (cenc) like in Widevine. PlayReady should also be signalled at master playlist.

There is also test content using this KEYFORMTAT:
https://testweb.playready.microsoft.com/Content/Content4X

According to doc, this should work with CENC-CTR for Windows 10 and Xboxes and with CENC-CBCS for Xboses only.

[kqyang]

@modernletter Nice! Thanks for the information.

[Able1991]

Any news? I want to try to encrypt playready with cbcs(playready+widevine+fairplay with my custom pssh from key servers), now the packer adds the necessary data to the dash manifest, but there is nothing in the hls playlist

[xusuona]

shaka-packager does not generate "ext-x-key" tag when encrypting hls with PlayReady, which obviously does not comply with Microsoft DRM standard, is there a way to solve this problem?

[Able1991]

shaka-packager does not generate "ext-x-key" tag when encrypting hls with PlayReady, which obviously does not comply with Microsoft DRM standard, is there a way to solve this problem?

I have a temporary solution, I add the desired tag to the playlist, taking the data from the mpd manifest. I take the mspr:pro value and add the line to the playlist myself.

#EXT-X-KEY:METHOD=SAMPLE-AES,URI="data:text/plain;base64,${msProFromMpd}",KEYFORMAT="com.microsoft.playready",KEYFORMATVERSIONS="1"

Just for now I don’t have the opportunity to check the correctness of this encryption, since my Windows laptop does not support cbcs playready, need to find an Xbox for tests =(
If you have the opportunity to check, tell me if it works in the player