How safe is it to create an .accdr file?

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hello, I’m designing an access application and I should then distribute it for a fee.
I save the application with the .accdr extension while the DB with the .mdb extension
I have entered an expiration date in the application, so after this date if one tries to open the application he receives an error and notice that he must purchase the update.

now I would like to know if this system I use is safe and guarantees that no one can open the application without paying for the subscription, or if there are tools or programs or systems that break this protection without problems.
Thanks for the replies.