Google has sent one of the most prolific independent developers for the Android phone a letter demanding he stop distributing software that greatly expands the capabilities of the fledgling smartphone operating system. Neither Google nor the developer, who goes by the handle Cyanogen, is saying much about the cease and desist letter. In a short chat transcript posted here, the developer says only that the demand centers around closed-source applications such as Google Maps and Gmail, which are bundled with CyanogenMOD, an Android modification program he maintains and offers for free.