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How to Decrypt .ts Files (Key is available)

(http://stream-recorder.com/forum/showthread.php?t=23265)

How to Decrypt .ts Files (Key is available)

Hi,

I have a Sat Box on which there is a service to download movies/series from the internet into the hard disk inside the Sat Box.

I managed to obtain the downloading link for one of the movies/series and downloaded it to my hard disk.

There was a decryption file key along with the downloaded movie file.

I would like to ask now if there is a way to De-crypt this video file based on the available key file.

I can watch the video file on VLC or MPC, but it is scrambled.

Below is the details of this video file from Media Info:

Code:

General

ID                                       : 0 (0x0)

Complete name                            : D:\!Temp\Temp_DL.nds

Format                                   : MPEG-TS

File size                                : 977 MiB

Duration                                 : 20 min 41 s

Overall bit rate mode                    : Variable

Overall bit rate                         : 6 598 kb/s

FileExtension_Invalid                    : ts m2t m2s m4t m4s tmf ts tp trp ty



Video

ID                                       : 2064 (0x810)

Menu ID                                  : 1 (0x1)

Format                                   : AVC

Format/Info                              : Advanced Video Codec

Format profile                           : High@L4.1

Format settings, CABAC                   : Yes

Format settings, RefFrames               : 2 frames

Codec ID                                 : 27

Duration                                 : 29 s 40 ms

Bit rate mode                            : Constant

Bit rate                                 : 6 000 kb/s

Width                                    : 1 920 pixels

Height                                   : 1 080 pixels

Display aspect ratio                     : 16:9

Frame rate                               : 25.000 FPS

Standard                                 : PAL

Color space                              : YUV

Chroma subsampling                       : 4:2:0

Bit depth                                : 8 bits

Scan type, store method                  : Separated fields

Scan order                               : Top Field First

Bits/(Pixel*Frame)                       : 0.116

Stream size                              : 20.8 MiB (2%)

Encryption                               : Encrypted

Color range                              : Limited

Color primaries                          : BT.709

Transfer characteristics                 : BT.709

Matrix coefficients                      : BT.709



Audio #1

ID                                       : 2068 (0x814)

Menu ID                                  : 1 (0x1)

Format                                   : MPEG Audio

Format version                           : Version 1

Format profile                           : Layer 2

Codec ID                                 : 4

Duration                                 : 20 min 39 s

Bit rate mode                            : Constant

Bit rate                                 : 128 kb/s

Channel(s)                               : 2 channels

Sampling rate                            : 48.0 kHz

Compression mode                         : Lossy

Stream size                              : 18.9 MiB (2%)

Language                                 : English

Encryption                               : Encrypted



Audio #2

ID                                       : 2069 (0x815)

Menu ID                                  : 1 (0x1)

Format                                   : MPEG Audio

Format version                           : Version 1

Format profile                           : Layer 2

Codec ID                                 : 4

Duration                                 : 20 min 39 s

Bit rate mode                            : Constant

Bit rate                                 : 128 kb/s

Channel(s)                               : 2 channels

Sampling rate                            : 48.0 kHz

Compression mode                         : Lossy

Stream size                              : 18.9 MiB (2%)

Language                                 : Chinese

Encryption                               : Encrypted



Text

ID                                       : 2073 (0x819)

Menu ID                                  : 1 (0x1)

Format                                   : DVB Subtitle

Codec ID                                 : 6

Duration                                 : 20 min 30 s

Delay relative to video                  : 1 s 70 ms

Language                                 : Chinese

Kind Regards,
Mouna.

Re: How to Decrypt .ts Files (Key is available)

You can use livestreamer, or streamlink or even ffmpeg does support key decryption.

Re: How to Decrypt .ts Files (Key is available)

Quote:

Originally Posted by PayNow (Post 92713)

You can use livestreamer, or streamlink or even ffmpeg does support key decryption.

Thanks for your reply.

Is there any guides on how to use streamlink or ffmpeg to decrypt the video file?

Re: How to Decrypt .ts Files (Key is available)

Quote:

Originally Posted by MoonLaf (Post 92718)

Thanks for your reply.

Is there any guides on how to use streamlink or ffmpeg to decrypt the video file?

It looks like you downloaded a single video file that was never in hls format (m3u8 playlist with ts segments).

If this is correct, then the "drm" is likely something other than hls-aes.

Look at the beginning of the file that you download with a hex editor for clues about the type of drm.

Re: How to Decrypt .ts Files (Key is available)

Quote:

Originally Posted by Yelloworanges (Post 92721)

Can't we figure the Encryption type from the Decryption File:

Code:

<?xml version="1.0" encoding="UTF-8" ?>

<Client_ECMs version="1.0"><Total_Session_ECMs>2</Total_Session_ECMs>

<CryptoPeriod Sequence_Number="1"><CryptoStart>5</CryptoStart><ECMStructure>AQAXCOQRW9IL6AAAXl8Q84FwYwAAARaiAjYDAAAA/3Uh4AEAAfwBDAIAgwD5SH4QdRwaK4Q66KD+aJXHi8SesZA0wIHsnbmDZjdy8lC4ImETT/7xnlGEviATpjRS/58XcHEYw5dH8jY87JcFIvz6hRnqWWHtSA==</ECMStructure><Parity>129</Parity></CryptoPeriod><CryptoPeriod Sequence_Number="2"><CryptoStart>720565</CryptoStart><ECMStructure>AQAXCOQRW9IL6AAAXl8VwYBwYwAAARaiAjYDAAAA/3Uh4AEAAfwBDAIAgwD5SH4QKf0TQfW0qdhdEVfLlfRjWpA0wIHsnbmDZjdy8lC4ImETT/7xnlGEviATpjRS/58XcHEYw5dH8jY87JcFIvz6hRnqWWHtSA==</ECMStructure><Parity>128</Parity></CryptoPeriod></Client_ECMs>

Re: How to Decrypt .ts Files (Key is available)

I digged into the issue and found the below information:

Encryption Type: PlayReady

and found also the below line:

Code:

"drmToken":"AAAEADaQNMCBaRWsfKxlUmvys4GISYjx4FT+rw4kY6YBIndnKYKBu/ykjQVTmsKOTkA/pnrfs0DU0uk=","drmFree":false

Re: How to Decrypt .ts Files (Key is available)

I don't know of any solution for PlayReady. Is the service offered on the web or on any other platform besides "Sat Box".
If it is offered on some other platform, there might be weaker forms of drm used.

Reversing PlayReady would likely take a lot of work and skill.

Re: How to Decrypt .ts Files (Key is available)

Quote:

Originally Posted by Yelloworanges (Post 92747)

I don't think we need to do encryption reversing.

The key is already available.

I downloaded (2) main files:

1. video_file.nds
2. key_file.xml

there was another file that has some information like this:

Code:

"physicalContentId":"video_file.nds"

"keyfileUrl":"http://Sat_Provider_Website/key_file.xml"

"fileSize":1024080871

"drmToken":"AAAEADaQNMCBaRWsfKxlUmvys4GISYjx4FT+rw4kY6YBIndnKYKBu/ykjQVTmsKOTkA/pnrfs0DU0uk="

"drmFree":false

and what about the key_file.xml content itself:

Code:

<?xml version="1.0" encoding="UTF-8" ?>

<Client_ECMs version="1.0"><Total_Session_ECMs>2</Total_Session_ECMs>

<CryptoPeriod Sequence_Number="1"><CryptoStart>5</CryptoStart><ECMStructure>AQAXCOQRW9IL6AAAXl8Q84FwYwAAARaiAjYDAAAA/3Uh4AEAAfwBDAIAgwD5SH4QdRwaK4Q66KD+aJXHi8SesZA0wIHsnbmDZjdy8lC4ImETT/7xnlGEviATpjRS/58XcHEYw5dH8jY87JcFIvz6hRnqWWHtSA==</ECMStructure><Parity>129</Parity></CryptoPeriod><CryptoPeriod Sequence_Number="2"><CryptoStart>720565</CryptoStart><ECMStructure>AQAXCOQRW9IL6AAAXl8VwYBwYwAAARaiAjYDAAAA/3Uh4AEAAfwBDAIAgwD5SH4QKf0TQfW0qdhdEVfLlfRjWpA0wIHsnbmDZjdy8lC4ImETT/7xnlGEviATpjRS/58XcHEYw5dH8jY87JcFIvz6hRnqWWHtSA==</ECMStructure><Parity>128</Parity></CryptoPeriod></Client_ECMs>

Is there any way to use the available information to decrypt the video file?

Re: How to Decrypt .ts Files (Key is available)

Quote:

Originally Posted by MoonLaf (Post 92749)

I don't think we need to do encryption reversing.

I said "Reversing PlayReady", meaning the PlayReady system - including file structure, methodology and implementation.
Some custom tools or scripts would likely be required.

Quote:

Originally Posted by MoonLaf (Post 92749)

The key is already available.

I downloaded (2) main files:

1. video_file.nds
2. key_file.xml

You make it sound so easy. Please do go on and explain more.

Re: How to Decrypt .ts Files (Key is available)

Quote:

Originally Posted by Yelloworanges (Post 92750)

I said "Reversing PlayReady", meaning the PlayReady system - including file structure, methodology and implementation.
Some custom tools or scripts would likely be required.

You make it sound so easy. Please do go on and explain more.

Sorry if I misunderstood what you've said.

I didn't say it is easy. I just want to know the approach that I should follow to decrypt the file based on the available information.