Full-content sources
Only allowlisted open/public-domain or compatible-license sources can be imported as full lesson drafts, with attribution and review. Current examples include VOA Learning English, Simple English Wikipedia and Project Gutenberg.
Source safety
Content Source Policy
Lesson phải source-backed nhưng không copy bừa nội dung có bản quyền. Admin review là bắt buộc trước khi publish nội dung import.
Reference-only sources
Restricted or unclear sources are metadata-only. The app may store title, URL, topic or category as a reference, but must not store full lesson text, examples, exercises, audio or answer keys without permission.
API/license sources
Cambridge/Oxford-style dictionary data and pronunciation assets require official API/license or outbound reference links. Scraping public pages is not treated as permission to republish.