: Valve has updated the rules behind trading games via the Steam platform, such that users must now own a newly-purchased gift for at least 30 days before they can trade it on.
There have been problems recently with traded keys being revoked -- for example, some third-party websites purchase Steam keys in bulk and sell them on to other users via the Steam trading system, only for the keys to be revoked days later by Valve.
This new 30 day rule, as revealed by Valve's Tony Paloma
, means that anyone buying Steam gifts to trade will now have to wait a full month before they can trade them on.
Note that games may still be gifted at any time -- this change only refers to trading games via the Steam trading system.