Unlicense
This is going to be a bit ranty...
| Feature | MIT | Unlicense |
|---|---|---|
| License text required in distributions | Yes | No |
| Copyright notice required | Yes | No |
| Attribution required | Yes | No |
| Can be used in proprietary software | Yes | Yes |
| Can be sublicensed | Yes | Yes |
| Minimum required boilerplate | LICENSE file + source headers | Nothing |
| Legal robustness across jurisdictions | Strong | Varies (fallback clause helps) |