Their respective logos and icons are also subject to international copyright laws. "LibreOffice" and "The Document Foundation" are registered trademarks of their corresponding registered owners or are in actual use as trademarks in one or more countries.
This does not include the source code of LibreOffice, which is licensed under the GNU Lesser General Public License ( LGPLv3).
For LibreOffice v.6.4, minimal supported Java version is 8 (see mailing list archive and commit).For LibreOffice v.6.3, minimal supported Java version is 6 (see Release Notes).For LibreOffice prior to v.6.3, minimal supported Java version is 5 (clarification needed about older support history).Since v.6.1.6 and 6.2.4, LibreOffice supports a wide variety of third-party JRE vendors in addition to Oracle, e.g. LibreOffice releases available from Apple App Store don't include Java support at all, because apps distributed in the App Store are not allowed to depend on optional functionality like Java. On macOS 10.09, neither JRE, nor JDK are found. You may find download links choosing JDK version on this page.
On macOS 10.10 and newer, please note that you need to install JDK, not JRE. It is possible to install both 32-bit and 64-bit Java simultaneously on the system and they don't conflict with each other - so if in doubt, just install both. Launching Java Control Panel ("Configure Java" available in Windows Start menu), and clicking "View" button on "Java" tab, opens Java Runtime Environment Settings window with Architecture column allowing to see if installed instances are 32-bit (x86) or 64-bit (x86_64). JREs which are installed into C:\Program Files (x86) (as opposed to C:\Program Files) are 32-bit (unless you manually modified install path during installation), so you may use this information to tell if your JRE is 32-bit or 64-bit.