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Disabling right clicks is one of the most upsetting attempts to protect content, because:
1. It still doesn't stop the dedicated thief
2. It does stop those of us who use right click for various navigational tasks. When a website obstructs right click, I'm out of there.
So, while I can appreciate your concern, the only real protection against theft is not to publish at all. In general, if you have content worth protecting, then you must proactively look for abuse and go after each incident.
Even if you lock your PDF documents with password protection, etc, the programs to crack them open are widely available.
So you won't be saving any money on transfer if they right or left click your link. If you want to save bandwidth you might want to look into ways of optimizing your PDFs for web use, or use a different format. In my opinion, while PDFs are useful for many things using them on the web isn't one of them. Especially since file size is often a problem with PDFs and people have to download Acrobat Reader just to be able to view the information you want to pass along. Both cases can cause the loss of a potential customer or visitor.