I did not tested this extensively and it might be old but when I needed this and searched for it I did not found this solution. So it might not work for you and I might be bad in search on the Internet.
But as I tend to forget things like this I write this quick post and next time I need to remove print etc. protection from a PDF file: I know where to look.
Take the PDF and make a backup copy of it.
Rename the PDF file to a PostScript file. (Change extension from pdf to ps)
Run the PostScript file through ps2pdf and ignore the errors.
Trying this sounds much better then buying software or upload the PDF to a could service. And anyhow this will only take a few minutes and if it fail, you can still buy software or put your sensitive information in the cloud and at risk.