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9th June 2016
09:16am BST

Photograph was released in 2015 and Amazing was written in 2009 but was covered by Matt Cardle in 2010 following his X Factor win.
They are being represented by the same lawyers who won a case against Robin Thicke and Pharrell Williams for copyright infringement over their single Blurred Lines. For that case, they won $7.4m, while they are seeking a settlement of $20m from Ed.
Here is Ed's Photograph:
And Matt Cardle's Amazing: