Star Trek is a multi million dollar a year business. Copyright violations are pursued because they dilute the market value of the entire franchise. Why buy a licensed copy of a DVD when you can get it for free on YouTube?
Consider the following scenario. Today the laws protecting intellectual property were allowed to expire. This was done in the spirit to deregulate the Internet and to promote freedom. Tomorrow, Google uses this new found freedom to transition from search engine to search repository. All cached material is stripped of identifiable information and all links are converted to point to cached material on Google's servers. Google is now the world's largest content farm.
That's a freedom I can do without.