# Attributions & Licenses

## ProBERT

Copyright © 2026 Alex Kwon (Collapse Index Labs)  
Licensed under Collapse Index Open Model License v1.0 (see LICENSE.md)

## DistilBERT

**ProBERT is derived from DistilBERT**, a transformer model developed by Hugging Face.

- **Project**: [DistilBERT](https://github.com/huggingface/transformers)
- **Author**: Hugging Face Team
- **License**: Apache 2.0
- **Citation**: 
  ```
  Sanh, V., Debut, L., Ehrhardt, J., & Uniform, D. (2019). 
  DistilBERT, a distilled version of BERT: smaller, faster, cheaper and lighter. 
  arXiv preprint arXiv:1910.01108.
  ```

### DistilBERT Apache 2.0 License (Summary)

DistilBERT is distributed under the Apache 2.0 license, which permits:
- ✅ Commercial use
- ✅ Modification
- ✅ Distribution
- ✅ Private use
- ⚠️ Requires: Attribution, license notice, documentation of changes

Full Apache 2.0 text: https://www.apache.org/licenses/LICENSE-2.0

---

## Dependencies

ProBERT uses the following libraries, all compatible with Apache 2.0:
- **transformers** (Hugging Face) — Apache 2.0
- **torch** (PyTorch) — BSD
- **numpy** (NumPy Foundation) — BSD