Help downloading from vtm go

[Jerry911]

Hello,

I have my own CDM but I am struggling with getting the (correct) pssh from vtm go.
I think I have found the correct one for widevine and the license url.
But I am also not sure how I use all of these to get the actual decryption keys.

Any help would be greatly appreciated.

[cedric8528]

give us the link

[Jerry911]

Any link really, I don't want anyone just giving me the keys for a given link.
I'd like to know how I can do it myself because there's lots I want to grab from there.

[thej911]

Any link really, I don't want anyone just giving me the keys for a given link.
I'd like to know how I can do it myself because there's lots I want to grab from there.

Providing a link is not that hard , at least to be a starting point from which you can get the keys for other links .

I'm also new to this field and still there is a lot to learn and i hope i'm doing this right , Anyway i will try to explain this by example.

Assuming your link is (hoping I'm using the correct site, you didn't provide a link! remember ?):

https://vtm.be/vtmgo/afspelen/7c077294-8fc6-4dbd-ab69-d53f157b613a

Now the first thing is to get the pssh , and fortunately there are 3 methods explained here :

https://forum.videohelp.com/threads/404586-how-to-work-out-the-pssh-when-not-shown-in-...pd#post2647121

NB: always use the search function in the forum , it will help you a lot .

now after we got the pssh which is for this example:

AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEGdLspHXzD73jL8NJc/sjt8=

Now we look for the lic url and of course you found it :

https://lic.drmtoday.com/license-proxy-widevine/cenc/

But this lic url is not gonna work i think ! , the lic url that works is (take a look at the additional parameter, thanks to lomero for this info):

https://lic.drmtoday.com/license-proxy-widevine/cenc/?specConform=true

Now take the headers and place them in headers.py ( you need a fresh header for this to work ,don't use your old one ), run the script enter pssh and lic url and i think you will get the keys , for this example they are :

--key 8ddc29852e4c354bbb775a20989b3cbc:d2d328b5bb5e7a2b7ced4cbbaf65dacc
--key 674bb291d7cc3ef78cbf0d25cfec8edf:f050b58c1a723f2da3b6a36a726cdb00
--key 925c184417c53ec5bd048ca2d261c7f5:89885dd4fda5835ce737fa0824a2f168
--key 4b19f3f67b6042668851af6a43933600:6541fbcdf4198bc389aa0336ea9ed880
--key 62836fda7a5a3c559d257fdf8174c2b6:070280a460af5009f7cb389d23a5471b

[Attachment 69556 - Click to enlarge]


Regards

[Jerry911]

Providing a link is not that hard , at least to be a starting point from which you can get the keys for other links .

I'm also new to this field and still there is a lot to learn and i hope i'm doing this right , Anyway i will try to explain this by example.

Assuming your link is (hoping I'm using the correct site, you didn't provide a link! remember ?):

https://vtm.be/vtmgo/afspelen/7c077294-8fc6-4dbd-ab69-d53f157b613a

Thanks for the writeup, point taken about the url, but yes you guessed correctly.
I also did spend some time searching the forum and trying out things before but I seem to be going backwards instead of making progress.
At this point it is clear I still struggle with getting the correct pssh.

I get this init data for the url you picked

AAAAjXBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAAG0IARIQjdwphS5MNUu7d1ogmJs8vBoIY2FzdGxhYnMiRGV5SmhjM05sZEVsa0lqb2lNREF6WTJaaE5EVXROMlEzTUMwME5tUmhMV0UwWlRBdE5XUTBNbUl3TVRGaVptSm1JbjA9MgdkZWZhdWx0

What I make out from this post you linked is I have to convert it to hex, so I did.


[Attachment 69568 - Click to enlarge]

Copy from "8 digits before 7073" to the end. These are in HEX. Convert it to Base64 again. That's your PSSH.

When I do this I end up with

AAAAjXBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7Q==

Which is not what you came up with

AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEGdLspHXzD73jL8NJc/sjt8=

The license url that I found was also the one without the last addition.

One last question I have is about the retrieving of the keys.

Now take the headers and place them in headers.py ( you need a fresh header for this to work ,don't use your old one ), run the script enter pssh and lic url and i think you will get the keys , for this example they are :

headers.py of which script exactly, I think getwvkeys?

Anyhow massive thanks already for the pointers you gave me.

[thej911]

I get this init data for the url you picked

AAAAjXBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAAG0IARIQjdwphS5MNUu7d1ogmJs8vBoIY2FzdGxhYnMiRGV5SmhjM05sZEVsa0lqb2lNREF6WTJaaE5EVXROMlEzTUMwME5tUmhMV0UwWlRBdE5XUTBNbUl3TVRGaVptSm1JbjA9MgdkZWZhdWx0

Which is a valid pssh and can also work and you don't have to do anything else .

But if you are wondering how i get mine , here it is :

go to : https://tools.axinom.com/generators/PsshBox

put the "System ID" (which i think is static for Google Widevine ) then select Widevine PSSH Data , and then put the "Key IDs" and all of this can be found inside the .mpd file :

[Attachment 69569 - Click to enlarge]

then click on Generate and it will output the pssh:


[Attachment 69570 - Click to enlarge]

another method is to use a script that was posted by [ss]vegeta , you input the kid and a similar output will be generated (search the forum for this).

Or simply use the pssh you found using eme logger (i think).

headers.py of which script exactly, I think getwvkeys?

I used "wks-keys" with my own CDM for this and it did the job .


Note: this is a weird coincidence ,but both of our usernames contain 911 in them!

Regards

[cedric8528]

Copy as Curl


[Attachment 69571 - Click to enlarge]

Go to curlconverter.com to convert in Python.

You have now all you need to fill headers.py

For me, I need to modify this file and let only the auth token.


[Attachment 69572 - Click to enlarge]

Go to WKS-Keys


[Attachment 69575 - Click to enlarge]

[Jerry911]

Note: this is a weird coincidence ,but both of our usernames contain 911 in them!

Weird indeed

Thanks for all the help guys, I think I got everything now except for my wks-keys not playing along for some reason.

[Attachment 69582 - Click to enlarge]


EDIT:
Not sure what went wrong there but...

[Attachment 69583 - Click to enlarge]

Thanks guys!

[cedric8528]

try to use only the "x-dt-auth-token" in your headers.py

And I think that the token expire quickly ...so you have to be fast

[Jerry911]

try to use only the "x-dt-auth-token" in your headers.py

And I think that the token expire quickly ...so you have to be fast

I was using only the auth-token so maybe it expired

One more question perhaps: how do you know which key is for which video/audio file/quality?
Do you just go by them one by one untill it decrypts?

[thej911]

Yes , always use a fresh header.

I'm Glad it worked for you mate .

Regards

[cedric8528]

you can use all keys with mp4decrypt

mp4decrypt --key ...... --key ...... --key ...... --key ..... --key ...... video.mp4 output.mp4

[Jerry911]

you can use all keys with mp4decrypt

mp4decrypt --key ...... --key ...... --key ...... --key ..... --key ...... video.mp4 output.mp4

Makes sense should've figured that out by reading the man.

[[ss]vegeta]

thej911
nice job on the somewhat thorough explanations.

[Jerry911]

I was also able to create an automated script. For the last step you can get the "x-dt-auth-token" header from the json reply that contains all the video info. Faster then converting the curl command

[Karoolus]

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