/usr/share/man/man1/tsdecrypt_dvbcsa.1.gz is in tsdecrypt 10.0-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/tsdecrypt.1.gz
/usr/share/man/man1/tsdecrypt.1.gz