dropbox: Add copyright detector info in limitations section in the docs

Dropbox files protected by copyright can't be synced and results
in an error. This issue reflects that in the Dropbox's limitations
section to warn rclone users and give info about why this error
occurs due that by default Dropbox API doesn't give enough info.

Proposed by the original repo owner in this comment:
https://github.com/rclone/rclone/issues/2301#issuecomment-388291079

Co-authored-by: Nick Craig-Wood <nick@craig-wood.com>
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Alex Guerrero 2020-05-31 13:22:54 +02:00 committed by GitHub
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@ -198,6 +198,12 @@ of this document](https://www.dropbox.com/en/help/145). Rclone will
issue an error message `File name disallowed - not uploading` if it issue an error message `File name disallowed - not uploading` if it
attempts to upload one of those file names, but the sync won't fail. attempts to upload one of those file names, but the sync won't fail.
Some errors may occur if you try to sync copyright-protected files
because Dropbox has its own [copyright detector](https://techcrunch.com/2014/03/30/how-dropbox-knows-when-youre-sharing-copyrighted-stuff-without-actually-looking-at-your-stuff/) that
prevents this sort of file being downloaded. This will return the error `ERROR :
/path/to/your/file: Failed to copy: failed to open source object:
path/restricted_content/.`
If you have more than 10,000 files in a directory then `rclone purge If you have more than 10,000 files in a directory then `rclone purge
dropbox:dir` will return the error `Failed to purge: There are too dropbox:dir` will return the error `Failed to purge: There are too
many files involved in this operation`. As a work-around do an many files involved in this operation`. As a work-around do an