Thanks for posting this. This can be much vulnerable for site's growth. We should keep in mind while using copyright content. Some questions regarding this:

1. Should we give links for reference of copyright content in answer?
2. What should we do regarding giving some statistics for question from IMDB or Wiki?
3. Images, audio, video of movie or TV also have copyrights. Shouldn't we post it in question or answer?
4. If entire question/answer violating copyright law, then should we edit it or flag for moderation attention to delete it?