48 CFR §1404.7003

1. (a)Internal documents required for administrative or operational purposes that have no public interest, educational, scientific, or research value;
2. (b)Classified publications and material otherwise marked prohibiting unauthorized disclosure;
3. (c)Tentative drafts such as preliminary planning reports that will appear later in revised or final form;
4. (d)Journal and magazine articles; or
5. (e)Disclosure materials containing any description, specification, data, plan, or drawing of any unpatented invention upon which a patent application is likely to be filed, unless an opinion by the SOL, or his/her duly authorized designee, has been rendered which finds that the interests of the Government will not be prejudiced by disclosure of such materials.