Howdy @Auston - There isn't a "watermark" feature available with the 60D, however, you can add 'Copyright Information' to the EXIF info for all of your images. To do this, just access the Menu and highlight the third setup tab. You'll see an option for Copyright information. This will allow you to enter your name and copyright details. To add a watermark, you'll need to accomplish that in post-processing like you mentioned. Happy shooting! :)
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I know this is off camera topic, but maybe someone can help?
Thanks Auston