Swedenskins....
Yes, it's an on-going 'battle' to retain proprietorship of one's wok/s on the net...and certainly beyond the capacity of any one individual.
As much as is possible it's really the task of each 'owner' to police his/her own property.
All anyone else can really do is offer assistance/advice as and when it occurs.
A site admin may have 'absolute power' over what happens on the site he/she administers but that carries little weight outside the immediate community. We generally get a good 'reception' amongst other related sites, eg Devart, Skinbase, etc....but in this case, I for one am a better brain surgeon than I am a Chinese or Japanese linguist....
Where possible, enlist the aid of someone with a working knowledge of the 'lingo' and word a request as simply and politely as humanly possible and generally you'll find people will comply.
Most abuses of perceived/actual copyright are through ignorance and are unintentional....