Originally Posted by Elhana
If it is just a .toc file - you don't have to ask any permission.
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This is also incorrect. All files included in an addon are copyright to the addon author, and permission must be sought for any modification, distribution, or reproduction that is not explicitly permitted by the license of the addon. This includes the toc, the lua and any other files included with the addon.
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If you are actually hacking addon - check licenses. If they are using opensource license, you don't have to ask.
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This is *generally* true. Most OSI licenses allow users 100% freedom with the covered work. Some license, like the LGPL, however, are not quite as open, so you'll want to check what rights the license permits to the users and what rights it reserves for the author specifically, rather than making assumptions due to the "type" of license it is.