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Get permission from the copyright owner to republish. It's nice to ask the author too but contact whoever owns the copyright, which isn't always the original publisher, especially for an older wor...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/40791 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/40791 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
**Get permission from the copyright owner to republish.** It's nice to ask the author too but contact whoever owns the copyright, which isn't always the original publisher, especially for an older work. Republishing includes putting it on your blog or even posting to a mailing list, though that gets fudged (ignore "free use" footers as they're not legally legitimate). You do not need permission to use it for an academic class (a real class). **You don't need permission to acknowledge.** If you're acknowledging a published work, you absolutely do not need get permission first. Authors and publishers are generally delighted to have you read and reference them. As long as you're not doing an acknowledgment in lieu of permission to reprint, you're good. If you're using an unpublished work, you should check in with the author, to make sure s/he still wants it publicized. And, if the work comes from family or friends, definitely ask. Legally you're probably okay here, but it's ethically a good idea to check.