[eureka]

Originally Posted by knc1

3.B: "Accompany it with a written offer . . .
Speaks only of when you should receive the written offer.
It does not speak to when you should receive the source code.
Sorry about that.

Now your next step is to identify something they are distributing under the GPL to which you hold the copyright.
In the USA, only the copyright holder (or their appointed agent) can bring action for a license violation.

http://www.busybox.net/license.html

License enforcement

BusyBox's copyrights are enforced by the Software Freedom Conservancy (you can contact them at gpl@busybox.net), which "accepts primary responsibility for enforcement of US copyrights on the software... and coordinates international copyright enforcement efforts for such works as necessary." If you distribute BusyBox in a way that doesn't comply with the terms of the license BusyBox is distributed under, expect to hear from these guys.

My company was distributing BusyBox binary without the source. We are contacted by users asking for the source, and we don't have it. Are we in trouble?

Not yet. But please stop doing that, and start distributing the source.

The above is what happens when people are acting in good faith. I note that the GPL imposes upon you the obligation to provide source code when you distribute. Whether you're using 3A, 3B, or 3C, they all start "Accompany it with", meaning source goes with binary at time of distribution. So if we get the binary from you and there's no mention of source code, your distribution of that binary didn't comply with the terms of the license. At that point, you're already in breach of the license terms, and it's now about fixing it. So if we have to approach you after the fact to get this information, we have the option to be really nasty about it.