Case Study: CoyIM Took Code From Another XMPP Client and Kept Its Licence

Mon, 26 Oct 2026 00:00:00 +0000

CoyIM is a chat client for the XMPP protocol, written in Go, that sets safe and secure options by default. Its README says it is built upon xmpp-client, an earlier XMPP client at github.com/agl/xmpp-client. CoyIM is under GPL-3.0. xmpp-client uses the three-clause BSD licence that Go itself uses, under the line “Copyright (c) 2012 The Go Authors. All rights reserved.” BSD code can go into a GPL-3.0 program, as long as the BSD notice goes with it.

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Case Study: CoyIM Took Code From Another XMPP Client and Kept Its Licence