Here's the second page of that PDF - that you seem to conveniently be ignoring.
PROHIBITED DISCLOSURES
Employees shall not disclose the following types of information to unauthorized recipients, except in the performance
of official duties or as authorized under the Prepublication Review process.
Information protected from disclosure by the Privacy Act of 1974, as amended;
Information that is classified or the disclosure of which could harm national security;
Information that reveals sensitive law enforcement, intelligence, counterintelligence, or counterterrorism techniques,
sources, or methods of the FBI or any other governmental entity;
Information that would reveal grand jury material protected from disclosure by Rule 6(e) of the Federal Rules of
Criminal Procedure;
Information that would tend to reveal the identity of a confidential source or the identity of a government agency or
authority or private institution which furnished information on a confidential basis;
Information that relates to any sensitive operational details or the substantive merits of any ongoing or open
investigation or case;
Proprietary information and trade secrets;
Information pertaining to wiretaps or intercepts, electronic communications (including storage mechanisms), or foreign
intelligence protected or regulated by Title III (Title 18, United States Code, Sections 2510-2520) or F.I.S.A. (Title 50,
United States Code, Sections 1801-1862);
Information pertaining to currency transaction reports regulated or protected by Title 31, United States Code, Section
5313-5319;
Tax return information regulated or protected by Title 26, United States Code, Section 6103;
Information pertaining to contractor bids or proposals or source-selection information before the award of the
procurement contract to which the information relates;
Any other information the disclosure of which is prohibited by law, Executive Order, or regulation; or
Any other information that the FBI would have discretion to withhold from disclosure pursuant to civil discovery
obligations, the Freedom of Information Act and Privacy Act, or any other statute, law, or regulation.
Please, feel free to let me know which of these categories applies to a non-classified memo-to-file.
