Batch-editing EXIF data to add copyrights?

I've recently become more serious about my photographic hobby and it dawned onto me that manually editing each JPEG to add my copyright was entirely the wrong approach. Thus, I was wondering if anybody would know of a Free Software tool that can batch edit the EXIF data in JPEG images? What I'd like to accomplish is simple:

• Add the string Copyright ©$YEAR Martin-Éric Racine where $YEAR is directly extracted from the original EXIF data's day when the picture was taken.
• Optionally, produce smaller versions of the source images to an output folder as TFCD samples for my models to take home.

Preferences go for a tool that is already packaged for Debian or Ubuntu but, worst comes, I could package the software myself.