[charcircuit]

They could just send you on email: XYZ is violating your license for project X in their project Y. Do you wish to take action?

[chii]

and if there's no reply, what happens? You cannot assume the copyright holder is affirmative in this case, and file a suit.

[jen20]

If there’s no reply, there’d be no action.

[charcircuit]

Then you wouldn't pursue it.