By choosing an antivirus for your computer, it's very useful to try it in action. There are demonstrations or what they are often called, Antiviral versions programmes. Demo-versions are conditional-free programmes in the sense that they are completely free during a trial period, which is usually 30 days. There are no functional restrictions on demonstration programmes compared to their commercial collections, except for the duration of the licence.
If, for any reason, no decision has been taken to purchase the antivirus programme during the period of the demonstration licence, the use of the antivirus can be extended for any time by subscription.