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  1. 3rd Sep 2023 06:05 #1
    Erevo
    Erevo is offline
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    Nov 2022
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    Hi guys,

    Would anyone be so kind to help me find out the process needed to retrieve a working key(s) for decryption?
    I'm scratching my head for a few hours to no result with this challenge.

    The website is open (free) but geo-protected:

    Code:
    https://www.kinobox.cz/film/255104-nikomu-to-nerikej/ke-zhlednuti-zdarma
Geo protection: Czechia
    Both MPD and licence response are base64 encoded. I have no problem to obtain PSSH.
    What did surprise me, when you base64 decode licence response, you will get both KID and KEY:

    Code:
    Search for: https://api.kinobox.cz/v1/files/videos/484961/license
Check values in: UniqueId and RSAPubKeyId, not sure of signature if needed
    When using these for decryption, approx. ~1 minute is decrypted (not the rest).
    I believe this means the key is somehow being regenerated constantly.

    Thank you for any help or advise.
    Last edited by Erevo; 3rd Sep 2023 at 06:37.
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  2. 3rd Sep 2023 06:50 #2
    iamghost
    iamghost is offline
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    Dec 2021
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    england
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    Code:
    --key b85b5fd0f5ac63791408582cf484f59e:a32a7e1333f311b982c4b609e4d94452
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  3. 3rd Sep 2023 07:32 #3
    Erevo
    Erevo is offline
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    Nov 2022
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    @iamghost
    Thank you, that key works flawlessly.

    Please, what exactly you did to obtain the key? I was unable to reproduce

    Code:
    PSSH: AAAAOHBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABgSELhbX9D1rGN5FAhYLPSE9Z5I49yVmwY=
Licence: https://wv-keyos.licensekeyserver.com/
    Edit: OK, solved. Just one time call to licence server... must be blocked.
    Last edited by Erevo; 3rd Sep 2023 at 18:10.
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