(a) Files are not marked as copyrighted material + can't be identified as such by netpeople before/after they start the load.
(b) The download stays on the storage unopened.
(c) User is closing the files, after a copyright warning came up.
Downloading + consuming in the knowledge that it is copyrighted material is a violation. Otherwise _
_ you can put up website with links to copyrighted material, save the User-IP (which is possible) and/or cut a deal with ISP's ( which is not necessary ), check out a netservice who is holder of the User-IP and let the lawyers do the rest.