This is a policy question. The proposed policy in the question (or answers) will be adopted in the case that after 7 days it receives at least 5 up votes with a 2/3 majority in favor. Please upvote or downvote this question based on your opinion of the policy statement as presented (not based on whether the premise of the question is reasonable).
Please first read: Should we permit linking to illegal stuff?
If you have a proposal please post it as an answer.
I will start with a draft just for online copies of copyrighted books which are both unauthorized and illegal (under laws of USA and the state that its laws apply to SE). If you want to include any other thing please post it as a modification to the policy in an answer.
This is a policy for the site that we adopt (in the case it is accepted) and does not imply legal obligations of any kind for moderators/community.
Policy Proposal (Jan. 19, 2011): Links to unauthorized illegal online copies of copyrighted books are not welcome on this site. Posting such links is considered unethical and not respectful to our colleagues; it is not a nice practice. Users are discouraged from posting such links.
Questions asking for such links should be closed.