The CD has been subjected to forensic tests in two laboratories -- one in the US and other in Hyderabad -- and both the laboratories have confirmed "clear signs of doctoring", he told a press conference here.
"There are multiple signs of electronic editing in these conversations," Prashant said terming the CD as "doctored and fabricated".
"There was a clear conspiracy on part of some people which appears to have blessings of many powerful people in the country," he said.
He said "both the laboratories have confirmed multiple elctronic editing in these conversations at very very critical places."
The purported telephone conversation between Shanti Bhushan, Yadav and Singh showed attempts at influencing a judge.
Prashant said the "fabricated" CD is being circulated to malign the civil society and derail the process of drafting an effective Lokpal Bill.