A patent for re-selling digital content has been granted to online retailer Amazon.

The patent describes a service similar to ReDigi in the US, which has raised copyright concerns with Capitol Records accusing the company of infringement.

The Amazon patent, which was filed in 2009 but granted last month, covers “digital objects including e-books, audio, video, computer applications etc” and could be implemented “when the user no longer desires to retain the right to access the now-used digital ...