1. At the bottom of the Project Explorer, click the Library Information () button.
2. Right-click the library and select Protect.

   The icons to the left of the library and all of the study objects within the library change to reflect a protected status.

Note: You cannot delete study objects that are the direct children of a protected study object. After you protect a study object, you cannot select Undo, but you can select Unprotect.

1. At the bottom of the Project Explorer, click the Library Information () button.
2. Right-click the library and select Unprotect.

   The icon to the left of the library changes to reflect an unprotected status.

Note: Unprotecting a library or a study object in a library does not affect study objects that you copied from the library into a study.