Greetings!
Ok, let's get something straight. While Peter's approach was unique, what he actually did has been around for a long time. Read Whalen, White, even the hyper-inflated Wilson and you will see that comparing published statements of the Society has been around for a long time.
This great tactic can be used by anyone on any website, in any published work, etc. but you need to play within the rules and within the Doctrine of Fair Use.
Quotes ran afoul of the law for two reasons in my opinion. 1. reproducing CDs which in effect contained significant portions of copyrighted work and 2) by trying to be completely "objective" and not commenting on the material.
In the U.S. the doctrine of fair use requires that some comment (scientific, critical, artistic, etc.) be made upon the excerpted material in order for the user to avoid copyright infringement. Also note that the quantity (size, amount) of the work is not an essential factor, even a tiny quantity can be an infringement, although the greater the quantity of the copyrighted material is used the more likely it would be deemed an infringement.
Therefore, if you plan on using any copyrighted material without permission, then you should make sure that you are within the bounds of fair use of the material by commenting upon the material and making sure that the purpose for which you are using it is an acceptable one.
Remember that copyright protection is an economic goal. A court will recognize and protect a copyright holder's rights when it is evident that the holder may suffer economic harm. Criticism, polemicism, critique, praise, apology, by themselves are not a basis to uphold a copyright holder's right to prevent others from use of the material.
Thus make sure to provide such commentary upon any excerpted material and refrain from offering anything for sale that contains such copyrighted materials.
As always, if you plan on making use of any copyright holder's work, if possible consult a local attorney, and be prepared to defend your use. As Quotes experience shows, even when the case is arguable or even if the law is on your side, defending a lawsuit might be and probably is going to be overwhelming. Some of you in this position may also wish to determine whether your state has a similar law as California's Anti-SLAPP law which might be used in a potential lawsuit.
As for mirror sites of Quotes, without encouraging this, if these are set up you should try to remove any reference to "Quotes" old domain or Peter, if there are any in the site, so as to avoid Peter's having to establish that he has nothing to do with such sites. (Such sites might even contain a disclaimer - stating explicitly that the site doesn't have anything to do with Peter Mossier or the Quotes.watcthower.ca website.)
-Eduardo Leaton Jr., Esq.