FIELD: information technology.
SUBSTANCE: versions of the inventions are particularly focused on situations in which a time source is inaccessible, unreliable or incorrect. Licenses are defined by a few parameters. Parameter values can be defined based on the protected content or applications or can be included therein Parameter values can be selected for determination and forced execution of the required trade-off between convenience characteristics and security.
EFFECT: high efficiency of protecting digital content by using time-based licenses.
25 cl, 17 dwg
