You can configure manual PDF export permissions, allowing PDF export to users without Teachme Biz account or to Teachme Biz users only.
*Only a group or folder administrator/sub-administrator can set PDF export permissions.
Please refer to the following manual on how to configure permissions.
▼ Enable or disable PDF export (Web Browser)
https://teachme.jp/8/manuals/9862315
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Related: Can I export a manual as a PDF file or print it out? – Help Center | Teachme Biz
https://help.teachme.jp/hc/en-us/articles/900006442103