The way I read the spec (and the actual samples on my system), the License paragraph (the last one) needs either the full license text or a short pointer to a file containing the license text (when it is a well-known license).  The examples I've seen looked like this:
```
License: GPL-3.0
 On Debian systems the full text of the GNU General Public
 License can be found in the `/usr/share/common-licenses/GPL-3'
 file.
```

The rest is fine.