Decryptor can't decrypt some videos, please help

[Paulo02]

I download lessons from the site class101 with yt-dlp, separately audio and video of course. On "cdrm-project.com" I write PSSH, license, headers and get a code like this "846f9aab3d31dbf14638919a64de5e28:a73aafc96708b102 30367a2161317c85". I saw on the forum that this is a kid and a key.
Then using mp4decryptor, I decode the video and merge it with ffmpeg. Everything works perfectly. I repeated all the steps as in this video and usually it works as well
https://drive.google.com/file/d/1tbFOGI_Je_-V9_ovwWLk-yT0zRfvckSB/view

But sometime I don't know why, some videos can't be decrypted. And the error appears as below. The video is not decrypted and the resulting output is not played. And it has a very small size, about 1 mb. I tried to reload the page, check back later. Rebooted the laptop. Nothing changes. And the keys is the same as it was before. If necessary, I can share the link and login / password.

G:\[01Down]>mp4decrypt.exe --key 846f9aab3d31dbf14638919a64de5e28:a73aafc96708b10230367a2161317c85 1.mp4 3.mp4

G:\[01Down]>mp4decrypt.exe --key 846f9aab3d31dbf14638919a64de5e28:a73aafc96708b10230367a2161317c85 2.mp4 4.mp4

G:\[01Down]>ffmpeg.exe -i 3.mp4 -i 4.mp4 -c copy fin.mp4
ffmpeg version 5.1.2-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
[h264 @ 00000209cb966b40] top block unavailable for requested intra mode -1
[h264 @ 00000209cb966b40] error while decoding MB 0 0, bytestream 28200
[h264 @ 00000209cb966b40] concealing 8160 DC, 8160 AC, 8160 MV errors in I frame
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '3.mp4':
  Metadata:
    major_brand     : mp41
    minor_version   : 0
    compatible_brands: iso8isommp41dashavc1cmfc
    creation_time   : 2022-08-30T17:44:52.000000Z
  Duration: 00:40:25.59, start: 0.000000, bitrate: 466 kb/s
  Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 461 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn (default)
    Metadata:
      creation_time   : 2022-08-30T17:44:52.000000Z
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
    Side data:
      unknown side data type 24 (754 bytes)
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '4.mp4':
  Metadata:
    major_brand     : mp41
    minor_version   : 0
    compatible_brands: iso8isommp41dashcmfc
    creation_time   : 2022-08-30T17:44:52.000000Z
  Duration: 00:40:25.64, start: -0.042667, bitrate: 118 kb/s
  Stream #1:0[0x1](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 116 kb/s (default)
    Metadata:
      creation_time   : 2022-08-30T17:44:52.000000Z
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
    Side data:
      unknown side data type 24 (754 bytes)
Output #0, mp4, to 'fin.mp4':
  Metadata:
    major_brand     : mp41
    minor_version   : 0
    compatible_brands: iso8isommp41dashavc1cmfc
    encoder         : Lavf59.27.100
  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 461 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn (default)
    Metadata:
      creation_time   : 2022-08-30T17:44:52.000000Z
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
    Side data:
      unknown side data type 24 (754 bytes)
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 116 kb/s (default)
    Metadata:
      creation_time   : 2022-08-30T17:44:52.000000Z
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
    Side data:
      unknown side data type 24 (754 bytes)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000209cb9edb00] Incorrect number of samples in encryption info
4.mp4: Invalid data found when processing input
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000209cb9562c0] Incorrect number of samples in encryption info
3.mp4: Invalid data found when processing input
frame=   98 fps=0.0 q=-1.0 Lsize=     371kB time=00:00:03.16 bitrate= 958.0kbits/s speed=28.8x
video:342kB audio:25kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.011676%

[mrmyst]

your files still seem protected, check your keys

[mov,mp4,m4a,3gp,3g2,mj2 @ 00000209cb9edb00] Incorrect number of samples in encryption info
4.mp4: Invalid data found when processing input
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000209cb9562c0] Incorrect number of samples in encryption info
3.mp4: Invalid data found when processing input
frame=   98 fps=0.0 q=-1.0 Lsize=     371kB time=00:00:03.16 bitrate= 958.0kbits/s speed=28.8x
video:342kB audio:25kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.011676%

[[ss]vegeta]

Yeah, the keys cdrm gives you are probably wrong, due to some error in caching keys.
Apply for getwvkeys.cc or get yourself WKS and CDM.

[Paulo02]

[ss]vegeta
Hey, thank you very much. I appreciate you.

Apply for getwvkeys.cc or get yourself WKS and CDM.

I have Discord, but Discord won't accept my phone number. Discord doesn't send confirmation message.
I've been trying to add my number to the discord for a long time, but it just doesn't work.
Is there another way to get these things?

[andrewzhong]

pm me the login if you just need the keys.

[mrmyst]

pm me the login if you just need the keys.

already helped, I wrote him a semi-automatic script that he can download

[gagaswift]

Hi guys

so I am a small artist student trying to learn art. IDM and other download managers would not work when I was trying to download class101 videos. I searched for several days on the internet and I am so happy that I found this thread.

I will try to follow the steps in above video, however if I find difficulties is it okay to ask questions here? many thanks

[gagaswift]

https://drive.google.com/file/d/1tbFOGI_Je_-V9_ovwWLk-yT0zRfvckSB/view

I cannot seem to understand:
1. where do you get main.exe?
2. When opening Console tab, I cannot find init data at all (for PSSH). How do you surface this?

[[ss]vegeta]

I cannot seem to understand:
1. where do you get main.exe?
2. When opening Console tab, I cannot find init data at all (for PSSH). How do you surface this?

1. Main.exe can be replaced by one of the following:

• getwvkeys.cc
• cdrm-project.com
• WKS and CDM

2. You need to install TamperMonkey add-on and add EME logger script to it.

Spends a few days reading this forum to get the hang of stuff like these.

[gagaswift]

I cannot seem to understand:
1. where do you get main.exe?
2. When opening Console tab, I cannot find init data at all (for PSSH). How do you surface this?

1. Main.exe can be replaced by one of the following:

• getwvkeys.cc
• cdrm-project.com
• WKS and CDM

2. You need to install TamperMonkey add-on and add EME logger script to it.

Spends a few days reading this forum to get the hang of stuff like these.

Thank you Vegeta! I will follow your instruction and update here.
Meanwhile yesterday I learned that I can also download the video using HLS downloader. It's a great time saver!

[cyadron]

So, recently class101 switched from Widevine to FairPlay DRM.
Is there anyway to decrypt the classes now?
Thank you!

[ElCap]

So, recently class101 switched from Widevine to FairPlay DRM.
Is there anyway to decrypt the classes now?
Thank you!

do you have an example?

[cyadron]

So, recently class101 switched from Widevine to FairPlay DRM.
Is there anyway to decrypt the classes now?
Thank you!

do you have an example?

For example:
https://media2.class101.net/videos/1292d5d2-0033-497b-9d57-fdb809247eac/video/1080?app...alse&cmaf=true

[ElCap]

its got widevine and fairplay, like a lot of streaming services

widevine part

#EXT-X-KEY:KEYFORMATVERSIONS="1",METHOD=SAMPLE-AES,KEYID=0xd8e133d5268d65644ddd1c45513c16cd,URI="data:text/plain;base64,AAAAbHBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAAEwSENjhM9UmjWVkTd0cRVE8Fs0aDGlua2FlbnR3b3JrcyIkMTI5MmQ1ZDItMDAzMy00OTdiLTlkNTctZmRiODA5MjQ3ZWFjSPPGiZsG",IV=0x6f7770347867703530306364686d3364,KEYFORMAT="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed"

[cyadron]

its got widevine and fairplay, like a lot of streaming services

widevine part

#EXT-X-KEY:KEYFORMATVERSIONS="1",METHOD=SAMPLE-AES,KEYID=0xd8e133d5268d65644ddd1c45513c16cd,URI="data:text/plain;base64,AAAAbHBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAAEwSENjhM9UmjWVkTd0cRVE8Fs0aDGlua2FlbnR3b3JrcyIkMTI5MmQ1ZDItMDAzMy00OTdiLTlkNTctZmRiODA5MjQ3ZWFjSPPGiZsG",IV=0x6f7770347867703530306364686d3364,KEYFORMAT="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed"

So, any idea on how we can decrypt it?

[ElCap]

i dont have a login, so i dont know for sure, but its probably standard widevine with an auth header