I have been approached to submit an extended version of a research paper in a journal. The original paper is already published in a conference proceedings by publisher A.
What "degree of extension" do I have to provide so that publisher B will (legally?) be able to publish my work?
Also, does "extended version" in this case mean additional results, or purely textual extension?
Answer
In most subareas of Computer Science having the paper with "at least 30% of new material" would be acceptable. This is particularly true of conference->journal paper transition, for instance when a conference version of the paper is extended with new results, more thorough description of the research contribution (and/or methods, materials, related work) and then submitted to a journal. Sometimes this also happens when a conference organizes a special issue of the best papers in a journal.
Nobody will measure how many words/letters you added, but you should be able to convince the reviewers/editors that the paper is extended. Pointing out the differences between the previous publication and the extended paper in the introduction would normally help to reviewers to assess if the extension is enough. Basically, what you want to avoid is Salami Slicing or Least Publishable Unit (see comment by BlackPudding at Is it unethical to submit for review multiple articles which overlap in some respect?)
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