It concluded that the plaintiff's suggestions for preventing sharing of copyrighted material were "unreasonable or pointless".[28] It also judged that RapidShare could not be held liable for copyright infringements by its users, and that while the service was legal, a minority of illegal use[29] could not be prevented by other measures proposed - for example keyword-based filtering (which could impair legal use), manual review of uploads (not feasible), or IP address analysis (as IP addresses can change frequently).[31][32]