It is ILLEGAL to use the logo unless you are a member of the Motion Picture Association of America (MPAA), the Recording Industry Association of America (RIAA), the Software & Information Industry Association (SIIA), the Business Software Alliance (BSA) and the Entertainment Software Association (ESA), subject to each member entering into a formal Uniform Authorization Agreement. Association members should contact the MPAA, RIAA, SIIA, BSA, or ESA for more information. Unauthorized use of the FBI seal, name, and initials are subject to prosecution under Federal Criminal law, including Sections 701, 709, and 712 of Title 18 of the United States Code.
Go figure.
And, do you really think a logo will keep people from pirating it? My personal opinion is that the more your music is out there, pirated or not, the more exposure you get. I think a personal plea from the artist (such as: Instead of copying this CD for a friend, please order one.) works better than an official logo that looks like it came from Big Brother.
However, you CAN use the following text without being arrested by the FBI:
Extended Warning:
Warning: The unauthorized reproduction or distribution of this copyrighted work is illegal. Criminal copyright infringement, including infringement without monetary gain, is investigated by the FBI and is punishable by up to 5 years in federal prison and a fine of $250,000.
Abbreviated Warning:
Unauthorized Copying Is Punishable Under Federal Law.
For more information:
http://www.riaa.com/whatwedo.php?content_selector=whatwedo_fbi_seal