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http://www.englishclub.com/writing/plagiarism.htm
Do you plagiarize?

Plagiarism is an illegal form of copying. It means taking another person's work (without asking) and calling it your own. Plagiarism can be accidental or intentional. Copying an entire essay or story and calling it your own is plagiarism. Copying one sentence word-for-word without "quotations" is also plagiarism. Whether you hand it in to a teacher, or post it in your blog, plagiarism is against the law in most nations.
Examples of plagiarism

• copying and pasting from the Internet and posting somewhere else without proper citation
• putting your name on another person's essay or project
• copying exact wording from another person's text
• using another person's photo, diagram, sounds, or ideas without proper citation
• presenting research in your own words without providing your references
• purchasing another person's text and using it as your own
• presenting ideas in the same format and order as your research source
• having a teacher, native speaker, or higher level student edit your paper to perfection

And what about image hotlinking

http://www.imagehotlinking.com/
Image Hotlinking (also known as leeching, or inline linking) is the practice of stealing bandwidth from other websites, by linking to an image stored on another server. By doing this, when a person visits a website with hotlinked images, the images must be downloaded from the other server, costing that server bandwidth, instead of the server being visited.
This practice can lead to gigabytes of bandwidth being "leeched" from other websites, with no benefit to themselves in return.
Am I Hotlinking Someone Else's Image?

It is quite possible that people new to webpages may be engaging in the practice of image hotlinking without realizing it. The best way to determine if you are image hotlinking is to look at the image code:

If the image is coming from a site that isn't yours, it's considered hotlinking or inline linking. To solve this, save a copy of the image yourself (assuming you have permission to do so), upload it to your web server, and link to it from there. Alternatively, you can upload it to the numerous free image hosting sites available around the net.