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by KMnO4 482 days ago
Web calendars don't offer authentication. You have to build it into the URL anyway. If a service I use -- let's say my bank's chequing account, wants to offer a calendar I can subscribe to, I'll be given a URL that looks like https://somebank.com/api/cal?token=abc12345. Anyone who knows that URL can see the calendar as well. No different than my own web app where the URL is https://mysite.com/dev/cal_abc12345.ics.

For a personal calendar, I see no reason to make it any more secure than an obscure URL.