"Supplying consumers with blueprints to print products designed by third parties is a business model fraught with risk, " said Lorna Caddy of law firm Taylor Wessing.

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"As a test, as a precedent, it is of no value, " says Tony Ghee, a partner at London-based law firm Taylor Wessing LLP who specializes in media regulation.

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Portrait Salon was formed last year and describes itself as a form of Salon des Refuses - an exhibition of works rejected from a juried art show - that aims to showcase the best of the rejected images from the Taylor Wessing Portrait Prize, which is organised annually by the National Portrait Gallery (NPG).

BBC: Portrait Salon projection

As the founders of Portrait Salon, Carole Evans and James O Jenkins write in the newspaper-style catalogue that accompanies the show, the idea began as an experiment and was not intended to upset or disrupt the Taylor Wessing, but to allow those whose work did not make the walls of the NPG another outlet.

BBC: Portrait Salon projection