Not sure about US Law but over here in the UK (I believe it is the same in the US) if you copy something (CD, Music Book etc.) and then sell or pass on the item without deleting your copy, is actually breaking the law.

While in most cases no one will notice, (Or care) as you have posted on the web then there are plenty of bots (Bits of software looking for all sorts of things (Google gets a lot of information like this) out there that look for things like this on the web, so be aware.

Bill