The development of the Internet created the opportunity for courts to publish their decisions on Web sites. This is a relatively low cost publication method compared to paper and makes court decisions more easily available to the public (particularly important in common law countries where court decisions are major sources of law). Because a court can post a decision on a Web site as soon as it is rendered, the need for a quickly printed case in an unofficial, commercial report becomes less crucial. However, the very ease of internet publication has raised new concerns about the ease with which internet-published decisions can be modified after publication, creating uncertainty about the validity of internet opinions.