Found this post about intellectual property at Dr. Dave's blog archive:
In my humble opinion, both! You should always have the right to claim intellectual property, but it should also come with responsibility. Beyond the law, that's the reality of the situation. Intellectual property is inherently difficult to protect, so whether or not you automatically have the "rights", the true rights are only acheived if you are willing and able to enforce those rights, and that is the privilege.