We have analyzed this issue and found that this happens when you print directly from the browser (like Google Chrome). In stead, we strongly advise you to save the file on your machine, open the pdf (with the password) using Adobe Acrobat Reader and then print.
1. Right Click on the link to pdf
2. Click on "Save link as" or "Save target as"
3. Select a folder on your machine
4. After the file is fully downloaded, double click on the file. Make sure that it opens with Acrobat Reader.
5. Enter the password and print.