Note that RocksDB is also dual licensed under Apache 2.0 and GPLv2 [1]. I believe they added GPLv2 to make it compatible with MySQL for MyRocks, because the ori

Note that RocksDB is also dual licensed under Apache 2.0 and GPLv2 [1]. I believe they added GPLv2 to make it compatible with MySQL for MyRocks, because the original Facebook+Patents license might not have been GPL compatible. Then when the Apache Foundation decided that Facebook+Patents wasn't compatible they switched it out for Apache 2.0 [2]. But that doesn't clarify much. Specifically your question about dependency licensing. RocksDB only depends on gflags (BSD licensed) and various compression library choices (allowing a choice of licenses). osquery seems to depend on a lot more libraries [3], so the likelihood of running into a licensing conflict seems a lot higher. [1] https://github.com/facebook/rocksdb/blob/master/db/db_impl.cc https://github.com/facebook/rocksdb/blob/master/db/db_impl.c... [2] https://meshedinsights.com/2017/07/16/apache-bans-facebooks-license-combo/ https://meshedinsights.com/2017/07/16/apache-bans-facebooks-... [3] https://github.com/facebook/osquery/blob/master/tools/provision.sh https://github.com/facebook/osquery/blob/master/tools/provis...