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If you are running OS X 10.10 and this is happening with iDefrag 5.1.2, please see this support article.
If you receive a message stating that an application you have downloaded is damaged and should be moved to the trash, it means that Gatekeeper, the security mechanism built in to Mac OS X, thinks that it has been modified somehow.
This can happen for one of two reasons:
Something has modified or damaged it. Some third-party software is known to do this (MacKeeper, for example), and if you have that installed on your machine this may be the cause of this problem.
There is some problem with the digital signature on the application binary itself.
You can work around this issue, should it happen, by temporarily changing the “Allow apps downloaded from” setting on the “Security & Privacy” pane in System Preferences to say “Anywhere”, then starting the application in question, then setting it back to “Mac App Store and identified developers”. However please note that by doing this you are disabling a security mechanism in Mac OS X that keeps you safe from malware. We do not, therefore, recommend that you take this approach in general, as the risk is that the program you downloaded was tampered with by a third party somehow and might harm your computer.
If this is happening with an application you downloaded directly from our website, please send us the output from the terminal command
codesign -dvvv "/Applications/TheApplication.app"
TheApplication.app with the name of the application in question.
If this is happening with one of our applications you downloaded from some other website, please do not use the file and delete it from your machine. We do not permit others to redistribute our applications, and if the signature check is failing they may have attempted to tamper with the program.
Posted by alastair at 2016-Apr-25 16:04:47 UTC. Last updated 2016-Apr-26 10:04:00 UTC.