The mother of murdered schoolteacher Jane Longhurst appealed to crowds at the Womad music, arts and dance festival in Reading to support a ban on violent internet porn sites.
Liz Longhurst, 72, has collected 22,000 signatures since February calling for such web sites to be shut permanently.
At the festival in Reading, where Jane grew up and went to school, she appealed for a major organisation to come forward and back the campaign.
Graham Coutts was jailed earlier this year for murdering Jane.
When police raided his home they found images from porn web sites, including strangulation and necrophilia.
He was later found to be recommending violent sex sites to others from his prison cell.
Mrs Longhurst welcomed news that BT had blocked its internet customers from accessing child porn web sites.
In the first censoring of the internet, the company has blocked child sexual abuse web sites which have been assessed as "illegal to view" in the UK under the 1978 Child Protection Act .
Campaigners believe the same technology could be used to stop people from viewing other violent sites.
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