There would normally be a lawyer-ish license here.  You probably wouldn't read it.

This is new and untested software, it might cause bad things to happen.  We have no liability, but we've tried to make it good.

We reserve our copyrights and all our other rights.

Finally, it's worth mentioning that your participation in our preview is voluntary. We aren't compensating you, and you release any claim to ideas or suggestions you make.
