Same here...I was always (initially by default) not entirely opposed to IP, especially since I had worked as a musician/programmer/engineer/teacher/researcher (all industries that currently rely on IP), until I actually worked at an unnamed computer engineering corporation where I was exposed to the reality of the patent system (since I had to review all the gory details of a bunch of patents related to my work), at which point I started to question the whole concept.  Naturally I searched google to help understand, and it really only took a couple pages of reading Against Intellectual Property (pdf: mises.org/books/against.pdf which is an argument based primarily on libertarian ethics) and Against Intellectual Monopoly (pdf: micheleboldrin.com/research/aim/anew.all.pdf which is a utilitarian argument so you don't have to be a libertarian in order to follow) for me to become consistently anti-IP.  On a side note, Stephan Kinsella's writings also exposed me to the whole Mises and Rothbardian tradition, which led me to fully-embrace anarcho-capitalism.