Highly Reusable Software
This is a "Free Software" license, but it is not a "copyleft" license. When you distribute copies, you may change license terms and restrictions, keep derivative works to yourself, or choose to charge a fee, for example. You do not have to pay us for these freedoms.
Software from a different source may have been modified (in which case they should not be calling it librock, which is a trademark only we can apply.) There could be additional license terms and restrictions not under our control.
Since we do not "sell" software licenses or require royalties, there is no accounting trail which can prove a license. We provide license certificates instead. This is a statement that "yes, you have the legal permission from us to make and distribute copies." [More about this]