There is also rsbep, which uses Reed Solomon FEC. This is a classic filter, so you can use it together with tar, gzip and gpg to protect archives against NSA snooping and bit rot simultaneously.
$ tar -cz indirectory | rsbep | gpg -e > out.tar.gz.rs.gpg
The Importance of Metadata:
It is not Who you know, or What you know, or even What you know about Who you know.
It is Where is Who, that provides the targeting for the missile.