In the digital era, how do you tell if anticipated publishable material violates existing copyrights?  If you apply a restrictive (conservative) standard, it become exceedingly difficult to publish.  If you apply a liberal standard, it becomes much easier to publish, but applying the same standard for your own material, yields very little protection against infringement by others.

In that climate, and in an arena of international digitial distribution, who is really going to litigate copyright enforcement in a single law making jurisdiction, and what good would that do?

Many big corporations have sought to address these issues by limiting consumer ability to download, print, etc.  This shortsighted policy appears to protect copyright, but in the long run marks the beginning of the end for those who rely on such methods.  

What is the productive method for protecting copyrights?