ftp://debian.lcs.mit.edu/debian-security/pool/updates/non-free/  direct

[DIR]z/  direct  3382+ twin directories
[DIR]u/  direct  4035+ twin directories
[DIR]n/  direct  7150+ twin directories
[DIR]m/  direct  6495+ twin directories
[DIR]l/  direct  7410+ twin directories
[DIR]c/  direct  18057+ twin directories