What are the rules on uploading documents? I want to upload online newspaper articles to practice translating but is this acceptable?
Most newspaper articles tend to be copyrighted; you can only upload article that aren't copyrighted.
From the upload document page:
Translation is free for content released under a creative commons license."
For more information about immersion, see these posts:
And Dessamator ”Immersion Community Guidelines”
Creative Commons licensed works are still copyrighted works, just with permissive licensing. You can also upload your own copyrighted works (and retain copyright of the translation) as long as you don't use the translation for commercial purposes (per the site terms).
Is there an easy way of finding out whether an article has been released under a creative commons license?
This is a question I also have. Personally, I like to read El País and when I find articles that might be of interest to Duolingo users I would like to upload them, but that does not seem to be possible.