1. **Marcel Vogel himself**: As the originator of the resea…

1. **Marcel Vogel himself**: As the originator of the research and documents, Vogel may have classified certain documents to protect his intellectual property and research.
2. **Government officials**: Government officials with the necessary clearance and authority may have classified documents related to Vogel's work.
3. **Corporate executives**: Executives at IBM, Vogel Applied Technologies, or other companies may have classified documents related to Vogel's work.
4. **Researchers and scientists**: Other researchers and scientists involved in Vogel's work may have classified documents to protect their own research and intellectual property.