1. Yes, it works, I thought it would be worse, I readed the comments to some program (I thought to this one), and they wrote that it simply superimposes the image, and where was the test – it becomes pictures, but the program “PDF Page Lock Pro” – – does well, everything is fair.
2.The main thing is to stick to the rules: do not add anything on the blocked pages (“PDF-XChange Viewer” allows you to add text, note) and not add pages to encrypted PDF-files.
3. There was an experiment:
hid the pages, then deleted the metadata of the PDF file, and when opened, the hidden pages remained hidden, not deleted.
Total:
I advise this program