[ben509]

The iCalendar spec[1] already features "encryption by committee" by being thoroughly obfuscated through its innate unreadability and undocumented vendor extensions.

On a more serious note, a sibling comment asked if there's an API. And, really, for an API to work, we'd need to agree on some kind of data structures. Reading that spec, and having mucked with LDAP, IMAP and related specs, it really feels like we're still banging rocks together in how we define the semantics of data exchange.

[1]: https://tools.ietf.org/html/rfc5545

[josephg]

The Fastmail devs have been working on getting JMAP for calendars standardised through the IETF. It’s intended as a mature, modern replacement for all the iCal / CalDAV junk. The biggest bottleneck at the moment is getting past the chicken and egg problem - we really need Apple and Google and others to adopt the new protocols for them to start to be useful. JMAP for email is currently struggling against the same adoption issue.

https://jmap.io/spec-calendars.html