Originally Posted by pdurrant
I suspect that it might be considered illegal, but only a civil offence, not a criminal one.
i.e. The copyright owner could sue you if they found out and thought it worth doing, but the police wouldn't be interested.
However! I am not a lawyer! For real legal advice you'd need to ask (& pay) a lawyer.
In the UK and several other countires it would be classed as assisting copyright infringement for commercial gain, which would make it a police matter. Dawn raids by armed police are not unheard of in cases like that. And if they were found to be doing it with any American books they could be extradited to stand trial there.