NYTimes has an decent article on some of the data sharing rules around science in general, and the Kepler mission in specific.  The Kepler team wants an extra 6 month embargo on data sharing because there were some delays in getting rolling.

Compare and contrast the 12 month embargo on data sharing, and the fact that extending it to 18 months is enough to warrent a Times article vs. the 17 year exclusivity of software algorithms.  I wish people would get more riled up about the later.