Summary 

Software is an essential component of the IT sector. The term "software" was spread in the 60s of the 20th century, and today it is a huge industry. It is believed that the first computational program was created in the 30s by Lady Ada Laqluisas for Charles Bebege's car. Since then, information technologies have quickly invaded human life and are continuously taking the leading positions there.

Today, the software market is one of the world's top-rated according to its scale and growth rates. Its subjects are software manufacturers, users and non-licensed so-called manufacturers of "pirated" versions.
With the development of the Internet, the Internet has grown tremendously and has become the fastest growing software industry, but in parallel with this, the Internet contributes to the wide spread and use of non-licensed programs that bring the loss of billions of dollars to the sector. Despite the fact that the "piracy" is punctuated by law according to BSA data, 43-45% of software was piratic in recent years.
Many expert researches are dedicated to the prevention of piracy control and its preventive measures in IT field. Almost all of them come to one conclusion - full protection from the piracy is associated with much expenses for the manufacturer and is almost impossible.

Hence,  the logical conclusion that can be considered to allow some amount of piracy by the manufacturer firms as the optimal decision. Consequently, the main task for these firms is to determine the optimal size of this "certain" amount.