Yes. Under Obama, the Justice Department has prosecuted more leakers of confidential information than prior administrations. However, the number is 6, so whether this is due to a difference in policy or random occurrences is not clear to me.
> whether this is due to a difference in policy or random occurrences is not clear to me
Also, 6 is a numerator. The denominator is unknown. Are there more leaks under the Obama administration, period? Are people more willing to leak? I don't feel like there's enough information available to make a judgement call.
The Obama administration has been much more forward and harsh against leaks that past administrations. At least, it appears that way to people looking in from the outside.