When you don't know exactly where the locked files are, and especially if they are located in more than one folder, the easiest way to unlock them will be using the Terminal (located in the Utilities folder inside the Applications folder). Follow these steps:
- Open the Terminal.
- At the prompt, type: sudo chflags -R nouchg
Note: If you highlight the text above, you will see that there's a space following nouchg. You must type this space. Also, the "r" in -R must be uppercase as shown.
- From a Finder window, drag your iPhoto Library folder onto the Terminal window. This will add its pathname to the command. When you're done, the command will look something like:
sudo chflags -R nouchg /Users/Your_Name/Pictures/iPhoto\ Library/
- Press the Return key to execute the command. You will be prompted for your administrator password; type it, and press Return again.