ipr

The document says that ICL was "not prepared to... give perpetual licences for all the IPR".

It goes on to say that if the Post Office ever wanted to change suppliers, the owner of the IPR "would be in a strong position to drive a costly settlement with the Post Office".

In it, a Treasury civil servant states that one of the "main problems" with the terms of a proposed deal with ICL for the Horizon software was the "issues surrounding ownership of assets and IPR of the kit acquired by" the Post Office.

A spokesperson for Sir Tony Blair did not address the BBC's questions around his knowledge of the IPR issues but said he "took very seriously the issues raised about the Horizon contract" at the time.

Documents released by the Post Office Inquiry show the "IPR issue" was often discussed by top-level Post Office executives.