The Major League Baseball Authentication Program, or MLB Authentication Program, is a program run by Major League Baseball Properties, the product licensing arm of Major League Baseball, to guarantee the authenticity of baseball merchandise and memorabilia. The centerpiece of the system is a tamper-resistant security tape sticker with an embedded hologram. Each sticker carries a unique alphanumeric code. The sticker is affixed to all game-used merchandise and memorabilia, while information about the item is entered into a computer database. Between 500,000 and 600,000 items are authenticated each season.