The new OS X Gatekeeper encourages desktop apps to be registered with Apple, with users warned against installing unsigned software unless they disable the prompts.

The benefits—and the potential pitfalls—are obvious. It's intended as as an anti-malware system (with a whitelist rather than a blacklist), and the registration process will be simple and inexpensive. It'll destroy the nascent market for sleazy Windows-style antivirus subscriptions.

On the other hand, it's under the OS vendor's control, and once established, offers it certain temptations. Will Apple use it to anti-competitively influence the desktop software market? Will OS X end up as closed to unapproved developers as iOS? Will the controls end up co-opted by governments?

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