The Jena GRDDL Reader is licensed under a BSD license.
If you agree to the license, then:
Since the intended use of this software involves running untrusted code retrieved from the Web, there is a significant risk of damage.
The next page gives an overview of some of those risks.
The final page allows you to read, and then agree to the BSD license terms; accepting these and all other risks.
If you don't accept the license terms, you can close this window, and the software will exit.