Unlocking .pdf files where you can't cut and paste

First, make sure your .pdf is not a scanned image. You can tell either because it will look like a photograph, or because you can select text but not cut and paste it. If the latter is true you have a locked .pdf. You can use the following website:

http://www.ensode.net/pdf-crack.jsf

To unlock it so you can cut and paste out of it.