Many privacy-protection Web sites work by inserting themselves as{{U}} (1) {{/U}}and masking the Internet addresses of users' computers. If a user in a country with{{U}} (2) {{/U}}goes to a privacy-protection site, that site becomes a shell that can be used to explore the Web. If the user types in the address of{{U}} (3) {{/U}}, the government will see the user's destination as the privacy-protection site that is the intermediary. So while a user{{U}} (4) {{/U}}at the Safe Web site, for example, the site has an embedded frame that gives{{U}} (5) {{/U}}.
But when governments are alerted, they can{{U}} (6) {{/U}}the privacy-protection sites. In March, for example,{{U}} (7) {{/U}}a number of such sites, including Safe Web.
Anonymizer combats such controls by changing{{U}} (8) {{/U}}and cycling through domain every few months. (Its users{{U}} (9) {{/U}}telling them the new names and addresses. )
"The names are{{U}} (10) {{/U}}and not suspicious," said Mr. Cottrell, Anonymizer's president. "{{U}} (11) {{/U}}is that they are not very fast. When we{{U}} (12) {{/U}}, it takes them a long time to block. "
But the governments{{U}} (13) {{/U}}catch up, so privacy-protection companies must develop{{U}} (14) {{/U}}to bypass the blocking technology. To control Web access, governments need to collect{{U}} (15) {{/U}}. To Counter the governments, privacy- protection service must{{U}} (16) {{/U}}.
In March, Safe Web{{U}} (17) {{/U}}by releasing Triangle Boy software. With Triangle Boy, Mr. Hsu devised a system in which users around the world can{{U}} (18) {{/U}}that allows their computers—and their Internet protocol addresses—to be used as conduits for sites that would{{U}} (19) {{/U}}. Triangle Boy presents a problem for blocking programs, which have to try to{{U}} (20) {{/U}}because the information is no longer stored on central servers.