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never has been allowed here or anywhere on the internet to steal someones work and post it. there are laws against this and can create legal issues for yourself and potentially the site hosting your stolen content.

read the FAQ about plagiarism.

What are Steemit’s policies on plagiarism?
If you are posting plagiarized or copied content, you can get in legal trouble for violating copyright laws. Plagiarized posts and spam are seen as abuse and will be downvoted by community members. If you are posting or using someone else’s content, you must ensure that you have the rights to use the content, and properly reference the sources where you got the material from.

the most important part is "you must ensure that you have the rights to use the content,"

without permission you are violating copyright law.

same for images, here is the info from the FAQ

Is it okay to use random pictures from the internet?
If you are using an image that is not your own, make sure you are allowed to use the image, and cite the source of the image.

Using random pictures from the internet without giving credit is discouraged. You may, however, use photos from “free image” websites such as Pexels.com or Pixabay.com. All photos on Pexels and Pixabay are free for personal and commercial use.

key parts for this:
"If you are using an image that is not your own, make sure you are allowed to use the image"

what you are doing is illegal. stop being lazy and create your own content.

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