I was looking for a way to unlock a zip file when i look to this program, it as no use to me but since i'm here i rather give some people a trick to get rid off the password on pdfs, you only have to open the pdf with the ColorSync utility and save it, that's all. I have to warn you that it may change the color i bit for the worst or the best but you will be able to bookmark, copy/paste, print it and the rest.

hope someone will find this tip usefull, i sure do use it sometimes