Thousands of children have been targeted in a safety campaign after a teenager was murdered by a man she met online.
Ashleigh Hall, 17, of Darlington, was raped in 2009 by Peter Chapman, who she met on a social networking site.
Prompted by the tragedy, Darlington Council compiled information packs and developed software to teach young people about internet safety.
The e-safety campaign is aimed at the borough's 14,000 teenagers.
Convicted sex offender Peter Chapman was jailed for the rape and murder of the Darlington College student in March.
Cyndi Hughes, Darlington Council's cabinet member for children and young people, said: "Ashleigh's death was a tragedy for everyone in Darlington.
"We took action by introducing new and fit for purpose curriculum materials and the e-Safety software.
"It is used to protect and prepare young people in Darlington's schools for many of the challenges they will face in the virtual world. Ashleigh has left a lasting legacy."