Sniffing for API calls from mobile applications has become the hip new way to open platforms that aren't yet ready for outside developers. Usually broadly-written terms and conditions essentially forbid this sort of usage, but it still happens. Snark.ly, a new iPhone app for people to share their funny one-liners, has gone a step further and expressly forbids the use of its private API in its terms.
"You must not access Snark.ly's private API," the Snark.ly terms read, "By any other means other than the Snark.ly iPhone application itself."
For more legal document spelunking, check out API terms and conditions done right.