Lawyer Petra Warrington on how to protect your business if you are holding online auctions, exhibiting and selling works on Instagram, or entering into sale contracts by email

The former husband of heiress Petra Ecclestone denies any criminality and says he will contest all charges

American Image Art founder alleges certain works are in the public domain and cannot be copyrighted

The decision follows a similar ruling made last July in which the estate’s counterclaims of non-payment of royalties and unauthorised reproductions were dismissed

Dos Santos and her husband Sindika Dokolo own around 3,000 works by artists including William Kentridge and Zanele Muholi

Recently rediscovered 18th-century work by artist Joseph Wright of Derby was bought by the Los Angeles museum in March last year

Bruce Munro claims the Fairchild Tropical Botanical Gardens intentionally imitated his works for its festive event known as The NightGarden

Pierre Le Guennec and his wife Danièle hoarded 271 works for 40 years

Matthew Green owes the firm around £3m, according to legal documents filed by the peer-to-peer lender

Appeals court says that guidelines limiting number of sellers in four green spaces are constitutional

Social media giant pays out after closing French teacher's account for posting photo of the Origin of the World

Catalogues raisonnés emerge as the latest front in the battle to authenticate works and secure market value

Eric McNatt files lawsuit over artist’s reproduction of a portrait of rock musician Kim Gordon

Pierre Le Guennec changes his story claiming artist's wife gave him 271 works in rubbish bag

Heirs of Greta Moll are demanding London museum returns painting of their grandmother

Judge's findings reveal what to look out for in art transactions

The legislation, sponsored by presidential hopeful Ted Cruz among others, comes as the race for the US election heats up

Old Master works by Orazio Gentileschi, Frans Hals and Diego Velázquez drawn into dispute

Seven of 11 specialists named by the gallery say they never authenticated work that turned out to be a forgery

Eleanore De Sole said she went into a “shaking frenzy” when she read that another work sold by Knoedler was suspected to be fake

Domenico De Sole bought a fake Rothko from the gallery in 2004

Lawyers for the collectors and the gallery go head-to-head as one of New York’s biggest art world scandals goes to trial

In 2007 the creative industries consultant noted that the “insider” aspect of the contemporary art market and hierarchy of knowledge and status that it creates was a significant part of its attraction

Recent corporate scandals have raised concerns that American charities should be examining their ethics policies