As specified by the COPYING file, fio is free software published under version

2 of the GPL license. That covers the copying part of the license. When using

fio, you are encouraged to uphold the following moral obligations:

- If you publish results that are done using fio, it should be clearly stated

  that fio was used. The specific version should also be listed.

- If you develop features or bug fixes for fio, they should be sent upstream

  for inclusion into the main repository. This isn't specific to fio, that

  is a general rule for any open source project. It's just the Right Thing

  to do. Plus it means that you don't have to maintain the feature or change

  internally. In the long run, this is saving you a lot of time.

I would consider the above to fall under "common courtesy", but since

people tend to have differing opinions of that, it doesn't hurt to spell out

my expectations clearly.