This is charitable of cpervica and tarsnap; that said, for many people, it's probably easier and safer (and you'll receive greater legal protection, long-term) to proceed by uploading your (even pre-encrypted) documents to Google Drive or a similar cloud-based storage system. Don't get me wrong - I like encryption and pushing the envelope for what's possible in terms of keeping content private for the general public.…
RTFA. This isn’t a sales pitch, he’s forgiving payments for those who have more important things to worry about than checking the expiry date on their CC.