The notes of the private investigator jailed for phone hacking in 2007 will be summarised and made public as part of the inquiry into the scandal.
Glenn Mulcaire's notebook forms a key part of the ongoing police investigation into the alleged illegal interception of voicemails by the News of the World.
Inquiry chairman Lord Justice Leveson ruled that a summary of the document should be prepared "so that its true significance and extent may be understood".
He said personal details of those listed as potential targets of phone hacking would not be included in general, although some victims who are already in the public domain or who give their consent could be named.
Names of journalists linked to entries in Mulcaire's notebook will be anonymised, although they will be placed in bands indicating how senior they were within the News of the World.
Mulcaire was jailed with the News of the World's former royal editor Clive Goodman in January 2007 after they admitted intercepting voicemail messages on royal aides' phones.
Lord Justice Leveson made the comments in a ruling on a request from the Metropolitan Police and Crown Prosecution Service (CPS) for him to ensure his inquiry does not affect the criminal investigation into phone hacking.
The inquiry is divided into two parts, the first looking at the culture, practices and ethics of the press in general.
The second part, examining the extent of unlawful activities by journalists, will not begin until detectives have completed their work and any prosecutions have concluded.
Police and prosecutors asked the inquiry chairman not to make public any significant document which has not already been widely reported, and not to take evidence during part one from anyone who is a suspect in the ongoing criminal investigation.