No, it doesn't mean the bond is not valid. The validation software is built on Adobe's platform and the issue is more than likely that your version of Adobe Reader does not have updated security certificates, hence it did not "trust" the signature security certificates on the e-Bond.
Here is what you need to do:
To trust the certificate, follow either of these two sets of steps below. Please note that the steps have small differences, depending on what version of Adobe is currently installed on your computer.
- Go to Edit
- Preferences
- Trust Manager
- AATL Certificates
- Click Update Now
OR
- Click on the signature
- Click on show signature properties
- Show signer's certificate
- Go to trust
- Add to trusted certificates