The only legal implemintation when editing Graphic images is copyright witch means that you have the right to copy so you can use that image when ever and for anything you want aslong as you own it
the uk copy wirght law is as follows
Types of work protected
Literary
song lyrics, manuscripts, manuals, computer programs, commercial documents, leaflets, newsletters & articles etc.
Dramatic
plays, dance, etc.
Musical
recordings and score.
Artistic
photography, painting, sculptures, architecture, technical drawings/diagrams, maps, logos.
Typographical arrangement of published editions
magazines, periodicals, etc.
Sound recording
may be recordings of other copyright works, e.g. musical and literary.
Films
broadcasts and cable programmes.
these laws have been around for centurys.
whats stated above has been taken from this website:-
http://copyrightservice.co.uk/copyright/uk_law_summary