[Mountain man]

Hello,
I'm turning some books into ebooks. Some in epub format, some in mobi. Most of them will be DRM free, but a couple of them will need it. I'm using Calibre to convert epub into mobi, with excellent results. In fact, I love Calibre! The point is... is there a way to apply DRM to the mobi file generated with Calibre?

Thanks in advance
Bob