[cap-talk] practical "weak capabilities"

[Matej Kosik]

Friends,

Yesterday I recharged my credit on a mobile phone via "recharging coupon" that can is sold openly on many places.

snaphsots of the front and the back side of the coupon
http://altair.dcs.elf.stuba.sk/~kosik/tmp/

That 14 digits obviously form weak capability. This coupon can be passed around (T-Com sell them to us, T-Com sells them to distributors which in turn sell them to us) and it gives any of its holder the right to activate the proper service (the first one will succeed).

The text (on the back side) is bilingual (Slovak/English) so it should be comprehensible. I think that it can be used during discussions about (i)relevenace of capabilities (when such discussions pop up, or are stirred up) also by others.

Did you see any similar obvious example?

PS: I am preparing a (easy) talk for Wednesday a couple of friends...

Regards
-- 
Matej Kosik