and private institutions that provide Internet access for their employees, customers, students, or members will sometimes limit this access in an attempt to ensure it is used only for the purposes of the organization. This can include content-control software to limit access to entertainment content in business and educational settings and limiting high-bandwidth services in settings where bandwidth is at a premium. Some institutions also block outside e-mail services as a precaution, usually initiated out of concerns for local network security or concerns that e-mail might be used intentionally or unintentionally to allow trade secrets or other confidential information to escape. Schools and libraries K-12 schools and libraries that accept funds from the federal E-rate program or Library Services and Technology Act grants for Internet access or internal connections are required by Children's Internet Protection Act to have an "Internet safety policy and technology protection measures in place". Many K-12 school districts in the United States use Internet filters to block material deemed inappropriate for the school setting. The federal government leaves decisions about what to filter or block to local authorities. However, many question this approach, feeling that such decisions should be made by a student's parents or guardian. Some of the fears associated with Internet filtering in schools include: the risk of supporting a predominant ideology, that views held by filter manufacturers are being imposed on students, over blocking of useful information, and under blocking of harmful information. A 2003 study "found that blocking software overblocked state-mandated curriculum topics extensively–for every web page correctly blocked as advertised, one or more was blocked incorrectly." Some libraries may also block access to certain web pages, including pornography, advertising, chat, gaming, social networking, and online forum sites, but there is a long and important tradition among librarians against censorship and the use of filtering and blocking software in libraries remains very controversial. Search engines and social media In 2007, Verizon attempted to block the abortion rights group NARAL Pro-Choice America from using their text messaging services to speak to their supporters. Verizon claims it was in order to enforce a policy that doesn't allow their customers to use their service to communicate "controversial" or "unsavory" messages. Comcast, AT&T and many other ISPs have also been accused of regulating internet traffic and bandwidth. eNom, a private domain name registrar and Web hosting company operating in the U.S., disables domain names which appear