In general, changing your user agent string to spoof Firefox, for example, is not a legitimate workaround. LWP::UserAgent is kind of a grey area, since you could use it to build interactive, as well as automated web applications. However, the folks at sciencedirect.com are clearly taking a hard line against it. If taioma chooses to spoof his user agent from a spider, and it is detected, he could get himself (and his whole company) banned.

Cheers,

Larry