I know this may come off as a very noob question.
I'm using Leaflet JS for mapping purposes in my application. For the mapping tile providers, I setup both MapQuest and Cloudmade. Both of them have a format similar to
tileserver.com/SOME_PARAMS/API_KEY/TILE_NUMBERS
to fetch the appropriate tiles to show in the map container.
What I'm confused is how can I keep the tiling javascript API key hidden from end users?