Unsolicited commercial e-mail (UCE), also called "spam" or "junk e-mail," aggravates many computer users. Not only can spam be a nuisance, but its cost may be passed on to consumers through higher charges from Internet service providers who must upgrade their systems to handle the traffic. Also, some spam involves fraud, or includes adult-oriented material that offends recipients or that parents want to protect their children from seeing. Proponents of UCE insist it is a legitimate marketing technique that is protected by the First Amendment. On December 16, President Bush signed into law S. 877, the Controlling the Assault of Non-Solicited Pornography and Marketing (CAN-SPAM) Act. The law, P.L. 108-187, went into effect on January 1, 2004.