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What does the padlock on a calendar in Lightning mean and how to eliminate it?

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I have a Tripit calendar in my Lightning calendar list. The Tripit calendar is not displayed and there is a padlock next to the calendar name (in the calendar list). What does that mean and how do I unlock it?

I have a Tripit calendar in my Lightning calendar list. The Tripit calendar is not displayed and there is a padlock next to the calendar name (in the calendar list). What does that mean and how do I unlock it?

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Right click the calendar and select properties. Uncheck the Read Only box.

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The problem is the Read Only check box is grayed out so I cannot select it. Any other suggestions?

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No. The calendar you added, however you added it is read only.