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Many forums have such restrictions: uploaded materials must not contain information elements from other similar websites (such as watermark URLs, icons, backgrounds, text, etc.). Ordinary documents don’t pose much of a problem, but ordinary users are not yet able to handle e-book materials. (To be honest, I’ve just joined the forum and am not very familiar with its rules; perhaps there are already relevant regulations or effective solutions in place.) If this forum also has relevant regulations but currently lacks appropriate solutions, could we consider designating certain individuals or having everyone participate to address this issue? Let’s discuss the specific steps again. For materials that are very helpful for everyone’s learning, we should encourage their dissemination and sharing (here we are only talking about sharing, not copyright issues). Please have the moderators and administrators correct the above statements.
Content that is subject to copyright disputes should not be posted. As for the watermark information in the material, if it is present, there is nothing that can be done about it; we are not an exclusive authority. However, if the content consists solely of promotional material with no substantive substance, it will be classified as advertising
Watermarks and similar elements can be removed using professional PDF reading software, allowing for a clean result.