Even though Pale Moon is open source and the source is supplied under the Mozilla Public License, redistribution of the Pale Moon binaries is limited by certain conditions under a proprietary license by Moonchild Productions, as permitted under 3.2b of the MPL v2.0.
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10.The only exception to this redistribution policy not otherwise covered in points 7 or 8 is if the repackaged or private build with official branding has been pre-approved by Moonchild for redistribution and is listed on this website as a contributed build.
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12. If you wish to distribute binaries for other platforms built on the Pale Moon source code, you may not use official branding unless these builds have also been approved as a contributed build as per point 10 of this license or if they are exempt under points 7 or 8 of this license. Even so, you obtain no rights to the Pale Moon name or logo, merely the permission to use it for the 3rd party build and only for as long as it is officially endorsed or satisfies the conditions for exemption. [..]
13. Unofficial branding ("New Moon") as supplied in the source code may be used for unendorsed binaries at all times. Thusly branded binaries with the New Moon logo and product name are not subject to the endorsement and exception rules as set out in previous points of this license and may be freely distributed subject to the Mozilla Public License as regards source code changes and availability. [..]