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Open Pull Requests to fix these Issues (Review help requested!)

• PR to fix License headers in specific files
• PR to fix the top level LICENSE file
• PR to update the license_header.py file and add apache licenses where missing

• PR for some fixes based on Apache RAT failures

Open Issues/Questions/Doubts/Concerns (Help Requested!)

1. What all can be excluded from RAT checks? Currently the following - 

   • these file types - *.xml ; *.css ; *.txt; *.md ; \..* ; *.ipynb ; *.html ; *.js ; *.json ; *.svg; *.config 

   • Submodules - 3rdparty/* ; dmlc-core/* ; mshadow/* ; dmlc-core/* ; dlpack/* ; nnvm/* ; ps-lite/*

   • R-package since it is not released - R-package/* 

   • src/operator/mkl/* 

   • Ignore all Dockerfiles - docker/*; Dockerfile* ; docker_multiarch/*

   • perl-package/* 

   • contrib/*

   • __init__.py files  

   • docs/*

      

2. There are still ~30 files with unknown licenses as per Apache RAT (`txt` attached)
   
   1. This list assumes all 4 PRs merged 
   2. This list assumes above excluded folders and formats are acceptable

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