Copyright your content by licensing it under a Creative Commons license.

This protect your content from being plagiarized by lazy people who are incapable of producing their own content. Licensing your work protects your hard work from being used and abused by other people – sometimes even for profit.

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The Creative Commons website has a number of different licenses (which you can get for free) you can use depending how you want your work to be used (or not at all). These licenses are also recognized by courts of law, so you can seek prosecution or fining of plagiarists if you so desire.

A number sites like the Open Source Initiative and the Free Software Foundation also offer licenses, but these are more geared towards software and code.