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HTDemucs-ft

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Hi Alexandre,

Thank you for Demucs. We are developing DrumSprite, a drum-practice application,
and are evaluating the official HTDemucs-ft drum-specialist checkpoint
f7e0c4bc-ba3fe64a.th for creating backing tracks with the drums reduced.

The proposed use is server-side inference on audio supplied by users, including
in a paid service. Only the resulting backing audio would be delivered and cached
for the user; the model weights would not be bundled in the client application or
redistributed to users. Our current work is local evaluation; we have not deployed
this checkpoint commercially.

We found your 2022 statement that the pretrained weights are not covered by the
code's MIT license and are provided for scientific purposes:
https://github.com/facebookresearch/demucs/issues/327#issuecomment-1134828611

We also noticed the later removal of the MIT license metadata from the
HTDemucs-ft model card:
https://huggingface.co/adefossez/HTDemucs-ft/commit/d74ac89c3a1e874fc78f152555cf4d8533f06cd4

Could you please clarify:

1. What license currently applies to this specific checkpoint, and does it permit
   commercial server-side inference and delivery of the resulting audio?
2. If separate written permission is needed, who can grant it? We would appreciate
   the appropriate Meta or other rights-holder contact if that is outside your remit.
3. Is a small-scale commercial license available, and what fees, attribution,
   reporting requirements or usage limits would apply?

We are asking for clarification and a possible quote, without assuming that the
source-code license authorizes the weights. We can provide usage estimates if needed.

Thank you,
The DrumSprite team