Crypt fingerprinting

Can anyone point me to some docs on what measures rclone crypt employs to prevent fingerprinting?

Or, if not, could anyone weigh in on how well rclone safeguards against it?

Could you define the term "fingerprinting" so we are all on the same page here?
This word can refer to a lot of different things.

Rclone uses a fixed 8 byte header on crypt files: https://rclone.org/crypt/#file-encryption

so if you want to discover whether a file is a crypt file that is pretty easy.

Finding anything out about what is inside the crypt file is very hard.