They are and they aren't, thus the confusion! :) Linseeds are not meant for eating, they're the industrial version of flax seeds that get turned into linseed oil which is toxic to us, used to waterproof and treat wood.
Flaxseeds are usually available at health food stores, often in bins, sometimes in cans. If you can't find any, check out the Seed supplement (I forget the exact right name) from Garden of Life. :)