Only versions, so they are suitable for smaller websites and blogs. Paid solutions in turn involve a subscription fee, usually for one year. Their price depends on the type of certificate and the Country Email List entity that issued it. The cost usually ranges from a few dozen zlotys to several thousand zlotys. What happens after the certificate expires? You can purchase a multi-year certificate.
Your website but the certificate is only valid for one year. After this you must renew i.e. apply again for another term and make payment. Typically an email is sent to the website owner to alert them that the certificate is about to expire. Certificates expire because everything on the internet changes rapidly and sites are bought and sold and as ownership changes.