firestring_estr_xml_encode(3) on Linux
The text 7e97e6d3e0bb, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it. The page shows this text now.
encode an estring into another estring for transmission inside XML data