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.
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Done.
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.