Source: libzstd Version: 1.3.2+dfsg-1 Hi Maintainer
As per upstream's commit on 2017-08-29 [1], libzstd's examples are now licensed BSD + GPLv2 again. See also the comment on upstream issue #774 [2].
Regards Graham[1] https://github.com/facebook/zstd/pull/821/commits/394bdd7db9c13c9fadad704e7535b3588c650d97
[2] https://github.com/facebook/zstd/issues/774#issuecomment-326140395