Ok.
Thanks for clarifying that.
A possible future "feature" for 2D Toolkit:
Add a small file which a developer can safely delete before sending work to a client.
The client would then have to buy 2D Toolkit to restore the missing file to get the project to build.
This way, a developer does not have to delete the whole 2D Toolkit folder, just the one file.
On a side note:
Thanks a lot for such a great plugin.
It's without a doubt the best 2D system I've used for Unity.
It's clear that you understand 2D well, and probably have a lot of experience with pre-Unity 2D systems