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After rebooting my Macbook Pro, when I click Skype to open it, it says "This file has been downloaded from the Internet, are you sure you want to open it?"

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It doesn't give me the option "this session" and "forever" as other applications did.

How can I tell Skype that it is ALWAYS ok to execute on my Macbook?

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I don't remember ever seeing the dialog with "this session" and "forever". If you select Open once, it removed the attribute and you're done for the future (until you download a new version of the application). – Daniel Beck Dec 17 '10 at 8:04
@Daniel Beck, I think it is likely to be related to whether the application has been properly signed... – bubu Dec 17 '10 at 9:39
Are you running Skype from the disk image (dmg) ? – 0xced Dec 17 '10 at 14:15
up vote 4 down vote accepted

choice 1. disable all this sort of prompt

defaults write LSQuarantine -bool NO

choice 2. disable this sort of prompt for 1 application

xattr -d -r /Path/to/application/
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