One of my signed thirdparty app was blocked to be loaded on host application. I verifed with "codesign" then it has problem on it. A few days later, I tried to figure out what is the problem. At that time, it's just worked and has result of codesign tool which is "valid on disk" and "satisfies its Designated Requirement". I didn't do anything with the app, I wonder status of certification could be changed?