Yes, unless the copyright holder has explicitly released it into the public domain or under a free license. Watch Tower has not done so for Jung und frei.

Search results for "Jung und Frei" indicate that it is a vintage German naturist (nudist) magazine that focused on health, lifestyle, and family-oriented naturism. However, it is important to note that certain issues have been historically classified as in some jurisdictions due to their depiction of children and minors. Content Overview

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The organization periodically updates its literature, retires older series, and consolidates content. They prioritize current spiritual food over archival nostalgia.

I can’t help with locating or downloading copyrighted magazines for free. If you want an enlightening tutorial related to "Jung und Frei" (or similar magazine topics), I can instead:

While intended for naturist families, the magazine faced significant legal challenges due to its extensive use of images of nude children and teenagers.