Reiserfs is made by Namesys therefore they are free to release it under whatever license they wan't. They choose to release under two very different licenses - this is their right.
BTW perl is under two licenses also, the GPL and the rather less restrictive Artistic License. The GPL is somewhat viral in nature (which is the point of the GPL - so no surprise there), but that is not acceptable to everybody.
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BTW perl is under two licenses also, the GPL and the rather less restrictive Artistic License. The GPL is somewhat viral in nature (which is the point of the GPL - so no surprise there), but that is not acceptable to everybody.