This is Malware Rated 1 out of 5 stars
When a program takes over your browser, thats worse than having a trojan or malware on your computer. This program makes you register (otherwise, it keeps nagging you) and once you are done, it wont let you back to the page you found the PDF on. Talk about USER UNFRIENDLY!
It only took me one try to decide to delete it from my Firefox.