You can disable it via the GUI in the Privacy settings: http://askubuntu.com/a/192270/235
I said 12.04 and not 12.10. There's no way of disabling the lens I removed in 12.04 (may be because they got introduced in that release).
EDIT: at least I couldn't find a way to disable them. Nothing in privacy settings and nothing with dconf-editor.
I fixed it with: sudo apt-get remove unity-scope-musicstores unity-lens-video unity-lens-music
(I couldn't find how to disable it)
It's not like I agreed to this when I installed the system, because I upgraded from a previous version (and a previous version, etc), and that behaviour wasn't there.
I don't know how Canonical could advertise these changes, but in the Amazon lens case I think RMS did it right.