release signing key is expired
gpg: assuming signed data in 'cmake-3.9.6-SHA-256.txt'
gpg: Signature made 11/10/17 08:34:10 Eastern Standard Time
gpg: using RSA key C6C265324BBEBDC350B513D02D2CEF1034921684
gpg: Good signature from "Brad King" [unknown]
gpg: aka "Brad King <brad.king@kitware.com>" [unknown]
gpg: aka "[jpeg image of size 4005]" [unknown]
gpg: Note: This key has expired!
Primary key fingerprint: CBA2 3971 357C 2E65 90D9 EFD3 EC8F EF3A 7BFB 4EDA
Subkey fingerprint: C6C2 6532 4BBE BDC3 50B5 13D0 2D2C EF10 3492 1684
gpg -a --export CBA23971357C2E6590D9EFD3EC8FEF3A7BFB4EDA | gpg
gpg: WARNING: no command supplied. Trying to guess what you mean ...
pub rsa4096 2010-02-16 [SC]
CBA23971357C2E6590D9EFD3EC8FEF3A7BFB4EDA
uid Brad King
uid Brad King <brad.king@kitware.com>
uid [jpeg image of size 4005]
sub rsa4096 2010-02-16 [E] [expired: 2017-08-12]
sub rsa4096 2015-08-13 [S] [expired: 2017-08-12]/cc @brad.king