This letter informs a company about potential copyright infringement involving one of their products.
1234, Main Street
Boston, MA 02123
31 March, 2005
<Recipient Address Goes Here>
<time you noticed> I was <your actions> when I noticed something that may indicate an infringement of <company name>'s copyright, and I thought I should bring it to your attention.
Since I have always enjoyed your products, I felt it necessary to inform you of this potential theft of your material. If you wish to pursue this matter and need more information, feel free to contact me.
encl: <List of enclosed items goes here>