Is the Dlib library free? Because at the company we have plans to use it to recognize documents with Python, and we were thinking of using this lib without a headache.
The DLIB license seems to be this: https://github.com/davisking/dlib/blob/master/LICENSE.txt (pls correct me if I'm referring to the wrong 'dlib project). The license appears to be permissive, so most users will likely consider it a 'no headache' license.
I cross-checked the license terms against the '4 essential freedoms' https://www.gnu.org/philosophy/free-sw.html and indeed the Boost Software License 1.0 appears to fulfill all of these.
But there are requirements you need to fulfill if you want to use code under this license. It is not in Public Domain, so you should be sure to understand the requirements and fulfill them when you use the DLIB library in your project.