access key A 32-byte identifier-password that gives you access to an account that has certain permissions with a repository. Usually represented as a 64-character hex string like so: 7ce4dbf18f7af8b420ee942bae42030aab344e91dc0e839260fcd71a4c9879e3

account key A 32-byte identifier for a hydrus service account. Usually represented as a 64-character hex string like so: 207d592682a7962564d52d2480f05e72a272443017553cedbd8af0fecc7b6e0a

address The pairing of both a server's host (be that an IP or a domain) with its port number, like so: 74.125.225.18:80, or google.com:80

archive The store of files you have chosen to keep.

file repository A service in the hydrus network that hosts files.

filtering A method of quickly deleting and archiving files within the client.

hash A file's unique identifier. The hydrus network uses SHA-256, which generates 32-byte hashes.

hydrus client An application that manages media and connects to services on the hydrus network.

hydrus network A loose collection of clients and servers that attempt to make media management and distribution easier.

hydrus server An executable that can run any number of hydrus services for any number of clients to plug into. It is managed entirely by the client.

inbox A special tag the client gives to newly imported and downloaded files to make them easier to find and review.

mapping The pairing of a particular file with a particular tag.

message depot A service in the hydrus network that stores messages.

metadata Information about a file, but not stored within the file. Filename, size, hash, modified dates, tags and location are all good examples.

petition A request from an uploader for particular content to be removed from a repository.

registration key A single-use 32-byte password that, when submitted to a repository, generates an account and an access key. They add a bit of privacy to the account creation process.

tag A short string of text describing a file.

tag repository A service in the hydrus network that hosts mappings.