Source code in this repository is covered by one of three licenses: (i) the
Apache License 2.0 (ii) an Apache License 2.0 compatible license (iii) the
Elastic License. The default license throughout the repository is Apache License > 2.0 unless the header specifies another license. Elastic Licensed code is found
only in the x-pack directory.
The docs directory does not specify another license, nor do the files contain any license header.
So I would say they are good to fork, but I’m pretty sure you have the right legal guys to confirm that.