With StampIt you can easily add watermark and copyright info in metadata to a bunch of your photos. The export can be done in custom album, and also you can reduce resolution of the images for further using.
Features:
- bunch image processing
- over 170 fonts
- rich watermark settings: position, shadow, background etc.
- save images in separate album
- set max resolution if needed
- fill Creator, Copyright Notice, Right Usage Terms fields in IPTC metadata
- fixed photos order
- added about screen
MetaGear - metadata editor 
Wonderoom Pro 
Photostein 