Pennycook raises a lot of issues related to the ideas of textual ownership and plagiarism. Here, in the USA, plagiarism is indeed seen as an easily defined term, which Pennycook (1996) argues is far from being the fact, especially from the point of view of people from non-Western culture. I have encountered situations, similar to the one described by Pennycook (1996, p.213) when due to power relations the works to be published had to include the 'famous' names and/or the names of supervisors. I witnessed the hypocrisy of professors when the lectures were chapters from books, and yet students were not allowed to do the same in their final papers. I read books that copied paragraphs and pages from other books (either by the same author or by different ones) and got away with it. What I found more interesting though, was the students' justifications for plagiarizing. I felt very close to some of their comments, even though Russian culture and understanding of the world is quite different from those of Hong Kong.
I agree that when learning a second (third, fourth, etc) language, the author's language may sound much more powerful than the one a language learner uses (Pennycook, 1996, p.223). Paraphrasing might obscure the meaning. I remember writing down phrases, words, sentences, and paragraphs I admired in order to improve my English (German or French). When learning a language, I do not really care about plagiarism. I learn patterns, words and phrases in context. I admit that the next step would be to use those phrases and grammar patterns in a different context, but it all starts with somebody's text. Therefore, the more you learn, the more influences you have from different authors (or maybe just few, depending on student's and teacher's preferences). In the end, once you are proficient in language, you might not even remember where you got ideas and phrases from. In Bakhtin's terms, you have appropriated them; in Western terms, you plagiarize them.
I learned English by repeating, memorizing, and appropriating. Or plagiarizing?
To quote one of the students, "Perhaps, plagiarism is a way of learning" (Pennycoook, 1996, p.225).
Pennycook, A. (1996). Borrowing others' words: Text, ownership, memory, and plagiarism. TESOL Quarterly, 30(2), 201-230.