In Russian, this is Философия блокировок.
Sorry, I meant Википедия:Философия блокировок (http://ru.wikipedia.org/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B...) which is the current location of the essay
The original wording, still used sometimes, is Защита границ
Cheers Yaroslav