Deep Focus is released under the MIT License.
But it cannot be used for commercial use without a modification, quoting from dlib-model's README:
The license for this dataset excludes commercial use and Stefanos Zafeiriou, one of the creators of the dataset, asked me to include a note here saying that the trained model therefore can’t be used in a commerical product.
Since this model is used in "Deep Focus", no commercial use is possible.