A few weeks ago I posted some links to some websites that help you with various PDF operations (merging, splitting, unlocking, etc). I tried to use the unlocking one recently. I have a PDF that I wanted to print so I didn’t have to sit at the computer. The PDF was protected and I couldn’t print it. I tried to use the unlocking service mentioned, but since the file was over 5 MB (it was 7 MB), it was going to cost $4.99. I found another service that seems to do the job. It is free and supports PDFs up to 200MB in size.
Check out http://freemypdf.com/