Although i sympathise with those who worry over copyright 
issues i think the best defence is to post only samples of 
artwork which you can print your name over and catalogues 
should only have thumbnails.  Similarly as a musician i 
only put a couple of tunes on the net and if they want more 
then they can contact me. To be honest though i regard the 
stuff i put on the net as public property.  New copyright 
laws are strangling much music which might otherwise reach 
a wider audience so i would not advocate any further 
tightening up of legislation. Too many freedoms are being 
eroded nowadays and mainly for highly dubious reasons. Lets 
try to keep the Net as free as possible.