Sometimes writers commit plagiarism accidentally because they do not know how to paraphrase correctly. To be acceptable (i.e., to not be considered plagiarism), a paraphrase MUST DO ALL THREE OF THE FOLLOWING:
Restate the information and ideas from the source accurately - whether it is a print or an electronic source.
Use the borrower's own language and style, not the original author's. (It's okay to mix some key phrases from the original source into the paraphrase IF you put those words or phrases in quotation marks.)
Identify clearly the original author / source of the paraphrased material.