In order to apply a protection to all the feeds included in a user list click on the Utility tab and then on the User Lists button; select now a list with the feeds that have to be protected and click on Apply Protection. Locked feeds will be displayed in the list with a padlock icon.
To remove the protection, click on the Remove protection button so all the feeds included in the list will be unlocked.
How the feed protection works
After the import of a locked feed it is still possible to open the feed, but its analysis data will be locked (not editable). In the file list or in the ingredient list of a recipe, locked feeds will be displayed with a padlock over a file icon.