IP filtering is different to the type of IP authentication that ProQuest and Chadwyck-Healey products do, in that rather than customers being automatically authenticated by their IP address, they still need to use their username and password somehow - Either by typing them in or clicking on an embedded link. The difference is that if they aren't within the prescribed IP range for that account then they won't be able to use the product even if the username and password are correct. This is used to provide extra security. For example, if your username and password is leaked out to the world, if they are not actually trying to use the product from within your institution they will not gain access. If you have questions please contact  Technical Support for assistance.