A document shows as Locked.
In Rhodes: Processing
Encrypted PDFs are common for tax packages and fund reporting. Rhodes can't read one without the password, so it stops and marks the row Locked rather than failing it.
Enter the password in the field on that row and press Unlock, or use the Password needed card Rhodes posts in chat. If it's wrong, Rhodes says Incorrect password and you can try again. Once it's right, the document is decrypted, read, and filed like any other.
The password is never stored. It's used in memory to open the file and then discarded — it isn't saved with the document or anywhere else. If you type a password into a chat message instead of the password field, Rhodes removes it before the message is saved; the field is still the better place for it. If the same provider locks every statement, you'll be asked each time. That's deliberate.