4401. [misc] Change LICENSE to MPL 2.0.
update copyright notice
3356. [bug] Cap the TTL of signed RRsets when RRSIGs are approaching their expiry, so they don't remain in caches after expiry. [RT #26429]
Regression test for: 3018. [bug] Named failed to check for the "none;" acl when deciding if a zone may need to be re-signed. [RT #23120]