After you publish your work in a journal, do you still own the copyright to your paper?
Can you send a colleague a copy of your work through email?
You'd like to use a chart or graphic from your paper in a presentation, are you allowed to do that?
Are you allowed to post a copy of your paper on your own website? institutional repository? Academia.edu/ResearchGate?
Many authors of scholarly articles may not realize it, but some journals may require that you transfer your copyright (not just of the PDF final version, but sometimes to the drafts of the article as well) to the publisher upon publication. Signing away your copyright often prevents authors from making freely available copies of their own work.