Feature Request: Vitalsource DRM

[nodrm]

Feature Request: Vitalsource DRM

[1e-24]

If there's a working implementation out there (ideally in Python, but other languages work too) that's not outdated I can try to add it, but I didn't find any.

There is an existing implementation of VBK license and content decryption in Python: vitalsource-vbk-decrypt . Some changes are required to support the current license format, but the bigger issue is the lack of publicly available private keys. The older AES mode is also not supported, and CMAC/HMAC is not treated properly but these are quick fixes and not exactly essential for decrypting modern content.

[noDRM]

I took a look at that DRM, but it doesn't sound like there's an easy way to implement that. If there's a working implementation out there (ideally in Python, but other languages work too) that's not outdated I can try to add it, but I didn't find any.

I also took a quick look to see if that's an "easy" DRM, but it doesn't look like I can quickly write my own DRM removal code.

[Adam7288]

How can I send you a sample?

[UPSA007]

No Worries. Thanks For trying.

[peter20051]

If there's a working implementation out there (ideally in Python, but other languages work too) that's not outdated I can try to add it, but I didn't find any.

There is an existing implementation of VBK license and content decryption in Python: vitalsource-vbk-decrypt . Some changes are required to support the current license format, but the bigger issue is the lack of publicly available private keys. The older AES mode is also not supported, and CMAC/HMAC is not treated properly but these are quick fixes and not exactly essential for decrypting modern content.

What is supported instead of AES then?

[1e-24]

What is supported instead of AES then?

The older AES format (aes1) I referred to uses a fixed IV. The newer formats (aes2, aes3) also use AES, but without a static IV. All three of these modes use AES in CBC mode. There is a fourth mode (aes4) but I haven't come across any licenses or content encrypted with this format yet. If you do find any aes4 samples, feel free to send them my way.

[peter20051]

but the bigger issue is the lack of publicly available private keys.

Without them is decryption impossible?

[1e-24]

Without them is decryption impossible?

I'd recommend looking for assistance on Reddit. There are several users who could help you out