LICENSE.txt

If you submit code or data to the ruby-advisory-db that is copyrighted by
yourself, upon submission you hereby agree to release it into the public
domain.

However, not all of the ruby-advisory-db can be considered public domain.
The ruby-advisory-db may contain some information copyrighted by the Open
Source Vulnerability Database (http://osvdb.org). If you use ruby-advisory-db
data to build a product or a service, it is your responsibility to familiarize
yourself with the terms of their license: http://www.osvdb.org/osvdb_license
(you may need to use a web archive service to view the license).

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.