We are planning to draw a chemical structure of a polymer. The chemical structure is common and widely available in website, journals etc. Thus, do we still need permission from publishers prior to publish in new publisher.
No. It is not necessary to cite sources of "common knowledge". (My rule of thumb is that it is common knowledge if you get more than 10 Google results.) Since you are doing the drawing yourself, there is no possibility of infringing some one else's copyright.
No. It is not necessary to cite sources of "common knowledge". (My rule of thumb is that it is common knowledge if you get more than 10 Google results.) Since you are doing the drawing yourself, there is no possibility of infringing some one else's copyright.
This is an important question and a nettlesome problem for authors. In addition to @Stephen Bruce's helpful answer, there is a bit more to add.
For any figure, the rule-of-thumb is give credit to any source that is a source of the figure either directly or indirectly. For example, any image from the web should be accompanied by the URL source of the image. Even that is not enough in the case where an image from the web is copyrighted. In that case, it is necessary to write to author of the image and request permission to include the image in whatever you are writing.
Some reader may want to verify details, so including the URL that you traced from is standard practice in the research world. The purpose of tracing (or redrawing) is not to hide the source, but to add some value. What was the value you added? Did you just make the lines thicker for better visibility? Or what? So then, you "paraphrased the picture"! Why was an original not good enough? Tell your reader why. E.g. Redrawn for greater clarity from 2 sources: [ ] and [ ].