DRM removal may or may not be legal in your country. It is not legal in the United States. The MobileRead Policy on the discussion of DRM removal is:
Moderator Notice
Please do not post links to DRM removal tools nor give detailed instructions for DRM removal .
Our policy is that we permit the discussion of DRM removal in the abstract, but not the provision of detailed instructions for DRM removal nor direct linking to sites where such instructions or tools are hosted.
Regardless of whether DRM removal is legal in your country or not, it is almost universally illegal to copy or distribute copies of copyrighted works without the authors permission.
There are many who oppose the laws on DRM removal and DRM itself (which make it difficult for users to read their books on all their devices), while supporting the laws against copyright infringement.