At the PDC conference on October 13, 2008, Microsoft placed the 'Silverlight XAML Vocabulary' under the Microsoft Open Specification Promise, stating in a press release, "The Silverlight XAML vocabulary specification, released under the Microsoft Open Specification Promise, will better enable third-party ISVs to create products that can read and write XAML for Silverlight." Since Moonlight is essentially a XAML reader, Debian's position is that Moonlight is safe for them to redistribute (leaving each user to agree to their own licensing for Microsoft's and others' binary codecs).