I've been doing a lot of cel art lately, for 
myself, friends, and as commissions, and I have a 
sort of 'ethics' question about reproductions.  I 
have a very VERY large amount of anime in digital 
form, and with some programs I have I can pretty 
much go into any anime I have and pull out a 
frame and reproduce it/splice it/customize it 
whatever.  

So the ethics question is, since I do a lot of 
key cels, and you generally come across those in 
in private galleries (and certain cels seem to 
have been traded all OVER the internet) what do 
you do if someone complains you have a cel that 
is close to/ very similar to one of theirs?