LynxPDF is a one-time purchase that grants you a perpetual license for lifetime use. Your purchase includes the first year of free technical support and updates, covering all new features and bug fixes. 

After the first year, you can optionally continue receiving updates and support by paying an annual technical fee of 20% of your contract price. This is entirely optional, if you choose not to renew, your current version remains fully functional.

You can purchase LynxPDF here—it is a one-time purchase for lifetime use.