First we need to understand the following. There are completely free programs, placed in free access for users and paid. To buy software is clear and easy - paid the money and bought the developer official user agreement with all of its preferences. With free software, too, everything is clear. A set of functions to them, as a rule, not rich, but everything is available "here and now". But the program from the category of shareware - something quite insidious. These products often have a guaranteed time or work in test mode (the completion of which you either buy the full version or lose access to it), or severe limitation on functionality. For example, in a free trial version of Word you can not create the file, and can read it only.

Consider the same program from the category of "Must have" for Windows 7 download software in more details: