You're right. I didn't pay attention to the licensing issue. Thanks for reminding me ;)
For the upcoming release, the Xdt package won't be open source. I'll check with the PM about the licensing issue.
If the license prohibits running on other platforms than Windows, then we'll make this a loose dependency, meaning that you'll get XDT when running on Windows, and no XDT support on other platforms. Does that address your concern?