what is this

[Anonymous]

+ Menu -> Virtual File System -> "List files with <hidden> attribute"
+ Menu -> Virtual File System -> "List files with <system> attribute"
+ Menu -> Virtual File System -> "List protected items only for allowed users"

[rejetto]

if you uncheck them, people won't browse over hidde/system/protected files
that is, those files won't be listed, but if you know the exact url to the files you can still get them