[libreoffice-l10n] Difference between voluntary and "without obligation"

Hi all,

Could anyone tell me what is the difference between voluntary and
"without obligation" in the following sentence.

Path:
https://translations.documentfoundation.org/<country
code>/libo34x_ui/desktop/source/

Text:
You now have the opportunity to register as a %PRODUCTNAME user.
Registration is voluntary and is without obligation.\n
\n
If you register, we can inform you about new developments concerning
this product.

-- 
Best Regards,
Nguyen Hung Vu [aka: NVH] ( in Vietnamese: Nguyễn Vũ Hưng )
vuhung16plus{remove}@gmail.dot.com , YIM: vuhung16 , Skype:
vuhung16plus, twitter: vuhung, MSN: vuhung16

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