[aapeli]

It's called dual licensing.

The Au Gov got the code for TraceTogether (what OpenTrace, the open source implementation of BlueTrace is based on) weeks before the source was publicly released as GPL.

[hyperpallium]

Not disputing, but do you have a link for when they got source?

Opentrace was open sourced 16 days ago https://github.com/opentrace-community/opentrace-android

[aapeli]

Don't have a public source, sorry.