Privacy-Sensitive Calendar Synchronization via DNS TXT Records
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Solution Overview
Problem
Conventional calendar synchronization systems fail to seamlessly integrate and synchronize events across different calendar hosts due to proprietary APIs, leading to isolated views of calendars on individual devices, which can result in missed meetings and double-booked timeslots due to lack of standard commands and cross-host communication.
Innovation Solution
A calendar synchronization system that utilizes TXT records in the DNS to establish trust and determine synchronization levels, enabling automatic synchronization across multiple calendar hosts by using a web service, database service, and calendar synchronization service to manage API calls and data propagation, allowing different levels of event information sharing and notification handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional calendar synchronization systems use proprietary APIs for each calendar host, then each calendar host can maintain its own data format and access control, but different calendar hosts cannot seamlessly integrate and synchronize events across multiple devices
Solution Approach 1:
The patent introduces a calendar bridge as an intermediary component that connects two calendar systems. The calendar bridge receives events from a source calendar, transforms them into the appropriate format, and publishes them to a destination calendar. This mediator approach resolves the incompatibility between different proprietary APIs while maintaining seamless synchronization across calendar hosts.
Solution Approach 2:
The synchronization system is divided into separate functional components: calendar clients, calendar bridges, and calendar hosts. Each component has a specific responsibility - clients initiate synchronization requests, bridges handle the actual event transformation and routing between different calendar systems, and hosts maintain their native calendar data. This segmentation allows each component to work independently with its own data format while achieving overall system integration.
2Loss of information
If calendar synchronization systems propagate all event information between calendars, then complete schedule visibility is achieved, but privacy-sensitive information may be exposed across unauthorized calendars
Solution Approach 1:
The patent implements different synchronization levels that allow selective propagation of event information. Instead of uniformly syncing all event details across all calendars, the system applies different quality levels to different destination calendars. For example, a calendar bridge can propagate full event details to personal calendars while only propagating free/busy status to shared or work calendars, thus maintaining privacy while ensuring schedule visibility.
3Ease of operation
If manual configuration of calendar synchronization rules is required for each calendar pair, then precise control over synchronization behavior is achieved, but user setup time and complexity increase significantly
Solution Approach 1:
The patent implements automatic detection and configuration of calendar synchronization rules. The calendar bridge automatically discovers available calendars, determines appropriate synchronization levels based on calendar properties and relationships, and configures event propagation rules without requiring manual user input. This self-service approach dramatically reduces setup time while maintaining precise control over synchronization behavior through automated decision-making algorithms.
Data Source
AI summary
A system comprises circuitry configured to operate as a calendar synchronization service and to operate as a database service. The calendar synchronization service is configured to query the domain name system to determine which one or more levels of event information are permitted to be propagated from a first electronic calendar hosted by a first calendar host to a second electronic calendar hosted by a second calendar host. The database service is configured to store rules for propagating events on the first electronic calendar to the second electronic calendar. The calendar synchronization service may be configured to receive, via an application programming interface (API), a notification of a first event on the first electronic calendar, wherein the first event has a start time, duration, summary, description, and one or more attendees. The calendar synchronization service is configured to determine, based on the rules, to-be-propagated other properties of the first event.