To protect your privacy we chose not to copy the content of your Trello boards on our servers, with the exception of the Elegantt milestones. For this to work, we need permission to store your Elegantt data in your cards descriptions. The Trello API only having three permission levels, we end up asking for more than we actually need. That being said, your Trello data will only ever transit between your browser and the Trello API, never through us.

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Also, you can remove all Elegantt data from your board at any time via the bin icon next to the main Elegantt switch.