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So what teachers and students in Trussville, Ala., are doing on the Internet might be considered illicit activity in other districts across the country. Lessons in the 4,100-student district near Birmingham include YouTube videos and film trailers, Internet chats with peers in Nigeria or award-winning children’s authors, even blogging sessions and Web research on open search engines such as Google.

Attempting to use online social-networking tools, read blogs, or see multimedia presentations on a classroom computer can generate a message that’s become all too familiar in many American schools: Access Denied.