All units are released under the public domain Unlicense
dcpcrypt
[...]
fpc-builtin
[...]
As far as I know, none of those units are public domain: They have each its own license. So what's licensed under "public domain Unlicense"?
ETA: Ok, I've seen your repo, which is composed of a few small utility functions (using the above packages) and demo projects. So your code, your rules