26 USC 7513 - Reproduction of returns and other documents

(a) In general 
The Secretary is authorized to have any Federal agency or any person process films or other photoimpressions of any return, document, or other matter, and make reproductions from films or photoimpressions of any return, document, or other matter.
(b) Regulations 
The Secretary shall prescribe regulations which shall provide such safeguards as in the opinion of the Secretary are necessary or appropriate to protect the film, photoimpressions, and reproductions made therefrom, against any unauthorized use, and to protect the information contained therein against any unauthorized disclosure.
(c) Penalty 
For penalty for violation of regulations for safeguarding against unauthorized use of any film or photoimpression, or reproduction made therefrom, and against unauthorized disclosure of information contained therein, see section 7213.