Open Letter to Guardian News Media:

"We have been made aware of your changes to terms and conditions for commissioned photography, issued to contributors on July 28.

At a time when press photographers are suffering severe hardship as a result of the economic downturn, it comes as a further blow to be informed that GNM demands unlimited re-use of our photographs free of charge.

The reduced demand for photographs during the recession will force many photographers out of business. If we have to allow free use of our images this procession will be accelerated.

The Guardian and Observer have a proud record of championing the cause of downtrodden workers in other countries.

We call upon GNM and the Scott Trust to behave in a manner consistent with their editorial policy, and respect the rights of their suppliers to be treated in a fair and equitable manner and in accordance with the spirit of the CDPA 1988.

As a first step, we urge you to enter into meaningful negotiations with the National Union of Journalists and other organisations representing photographers."