Chatham House rule
Chatham House rule says that anyone who comes to a meeting is free to use information from the discussion, but is not allowed to reveal who made any comment.
Several meetings and conferences within the Wikimedia movement has adapted a variation of this rule.
Wikimedia movement practices
The Strategic Wikimedia Affiliates Network (SWAN) meetings applies a variation of Chatham House rule. WMF employees on duty are excluded, which means that their presentation and/or statement may be cited on their name.
Some of the Free Knowledge Advocacy Group EU's meetings (eg: Monitoring sessions) has applied the rule as "statements and quotes are not attributed to speakers and organisations, unless these have themselves presented their positions to the public."