ဤထိန်းချုပ်မှုကို ပြင်ဆင်ခြင်းဖြင့် ဤစာမျက်နှာကို အလိုအလျောက် အပ်ဒိတ်လုပ်ပေးပါမည်
![](https://help.apple.com/assets/59D1B1440946225478B7C4D4/59D1B1450946225478B7C4DB/en_US/c42f1daa28adecbfab6762cbd4f87c10.png)
Lock PDFs and images
You can lock a PDF or image so that it can’t be edited or deleted. If you own a locked document, you can edit the document after unlocking it. Others can change the document’s contents only by creating a duplicate of the document and editing the duplicate.
Lock or unlock a PDF or image open in Preview: Move the pointer next to the document’s name in the title bar, click the arrow that appears, then select or deselect the Locked checkbox.
Tip: To lock or unlock a file in the Finder, select the file, choose File > Get Info, then select or deselect the Locked checkbox.