Conditions for use and distribution of software products are regulated by so called "Licenses" used for establishing the scope of rights and obligations, which accrue to legitimate user of a software product.
In accordance with the norms of the Russian legislation, availability of license is not considered a mandatory requirement for a software product. Legitimate acquirer of the software copy, regardless of the terms of software license, has the rights of "free use", including the right to install and start the program on a single computer, but he is not allowed to copy and modify the program. Free Licenses provide the user with the number of additional rights, as compared to the rights of "free use": right to start the program for any purpose, right to study and adapt the program, right to distribute the program either gratis or for a fee, as well as the right to develop and improve the program. In order to obtain the above rights, you must accept the license conditions.