Best licenses for Open Hardware
Have you looked at the Creative Commons license pages http://creativecommons.org ?
The first three items in your list are condition options on the license page. 
It almost sounds like the -- "by attribution" "share alike" license meets your requirements. You can also add other terms and conditions to the license.

Unless there are patents involved in your work there may not be a lot of protection
anyways. Although someone may not be able to create derivative works using your
schematics or layout files they could redraw the schematics and do their own layout
of the board. Of course if you have a 12 layer board with 4/4 design rules and buried
vias not many people will have the resources to copy it anyways ;)