This is not a freebie but if you want to get started learning about privacy law, Privacy Law Fundamentals will be a great investment in your knowledge.
The authors are Daniel J. Solove, John Marshall Harlan Research Professor of Law at George Washington University Law School, and
Paul M. Schwartz, Professor of Law. U.C. Berkeley School of Law, and Director of the Berkeley Center for Law & Technology
In addition to the print format, the book is also available in electronic format.