If you are the webmaster in a commercial setting then refer to the contract which should state your rights and obligations. There is certainly some misunderstanding. Since this is a volunterr organisation perhaps better to sit down and iron out the differences over a coffee or hotpot which is better. If you invite me along I will supply the beer.
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Circumnavigator, lawyer and columnist and the man who divides his time between Singapore, Hong Kong and China. I believes that etiquette transcends nationality and race. 
In this column I will offer stylish advice to everyday questions on etiquette at work and at home and anything else that may be bothering you.