Is there any way to unencrypt/remove the password to access a pdf file for free?

I forgot the password to a VERY important file of mine and don't have a backup. I've tried every program I could find using google but most of the have restrictions on how or what they can try. Does anyone know of a program that can decrypt or remove the password of a pdf file that actually works? Or a program that can change an excrypted pdf file into a word document? Anything like that would work.Is there any way to unencrypt/remove the password to access a pdf file for free?
Try OpenOffice http://www.openoffice.org

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